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212220021020 = 225753792771307
BaseRepresentation
bin1100010110100101001…
…1001000100100011100
3202021202222102001221112
43011221103020210130
511434111311133040
6241254215321152
721222003262310
oct3055123104434
9667688361845
10212220021020
118200273a927
12351680801b8
1317020c2ab47
14a3b3013b40
1557c11a6365
hex31694c891c

212220021020 has 192 divisors, whose sum is σ = 527807508480. Its totient is φ = 70176457728.

The previous prime is 212220020989. The next prime is 212220021077. The reversal of 212220021020 is 20120022212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 212220020986 and 212220021004.

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, 162371207 + ... + 162372513.

It is an arithmetic number, because the mean of its divisors is an integer number (2748997440).

Almost surely, 2212220021020 is an apocalyptic number.

212220021020 is a gapful number since it is divisible by the number (20) 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 212220021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263903754240).

212220021020 is an abundant number, since it is smaller than the sum of its proper divisors (315587487460).

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

212220021020 is a wasteful number, since it uses less digits than its factorization.

212220021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 212220021020 its reverse (20120022212), we get a palindrome (232340043232).

The spelling of 212220021020 in words is "two hundred twelve billion, two hundred twenty million, twenty-one thousand, twenty".