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121020200200020 = 2235113173917147673
BaseRepresentation
bin11011100001000100110110…
…000010110010011101010100
3120212111102021211102221110210
4123201010312002302131110
5111330243332222400040
61105215525031445420
734330264243616502
oct3341046602623524
9525442254387423
10121020200200020
1135619419028390
12116a6638226870
13526b2046c7494
1421c55a21d3672
15ded02e4d1480
hex6e11360b2754

121020200200020 has 192 divisors, whose sum is σ = 370925010844416. Its totient is φ = 29238016389120.

The previous prime is 121020200200001. The next prime is 121020200200037. The reversal of 121020200200020 is 20002002020121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121020200199969 and 121020200200005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 819440904 + ... + 819588576.

It is an arithmetic number, because the mean of its divisors is an integer number (1931901098148).

Almost surely, 2121020200200020 is an apocalyptic number.

121020200200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121020200200020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185462505422208).

121020200200020 is an abundant number, since it is smaller than the sum of its proper divisors (249904810644396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121020200200020 is a wasteful number, since it uses less digits than its factorization.

121020200200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151930 (or 151928 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 121020200200020 its reverse (20002002020121), we get a palindrome (141022202220141).

The spelling of 121020200200020 in words is "one hundred twenty-one trillion, twenty billion, two hundred million, two hundred thousand, twenty".