121022000020 has 24 divisors (see below), whose sum is σ = 254173697064. Its totient is φ = 48403562496.

The previous prime is 121021999963. The next prime is 121022000023. The reversal of 121022000020 is 20000220121.

It can be written as a sum of positive squares in 4 ways, for example, as 7509608964 + 113512391056 = 86658^2 + 336916^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121021999970 and 121022000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121022000023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135117 + ... + 510196.

It is an arithmetic number, because the mean of its divisors is an integer number (10590570711).

Almost surely, 2^121022000020 is an apocalyptic number.

121022000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121022000020 is an abundant number, since it is smaller than the sum of its proper divisors (133151697044).

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

121022000020 is a wasteful number, since it uses less digits than its factorization.

121022000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654699 (or 654697 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 121022000020 its reverse (20000220121), we get a palindrome (141022220141).

The spelling of 121022000020 in words is "one hundred twenty-one billion, twenty-two million, twenty", and thus it is an aban number.