20021220112100 has 36 divisors (see below), whose sum is σ = 43876206552948. Its totient is φ = 7929196080000.

The previous prime is 20021220112097. The next prime is 20021220112133. The reversal of 20021220112100 is 121102212002.

It can be written as a sum of positive squares in 6 ways, for example, as 138699635776 + 19882520476324 = 372424^2 + 4458982^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 991139411 + ... + 991159610.

Almost surely, 2^{20021220112100} is an apocalyptic number.

20021220112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021220112100 is an abundant number, since it is smaller than the sum of its proper divisors (23854986440848).

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

20021220112100 is a wasteful number, since it uses less digits than its factorization.

20021220112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982299136 (or 1982299129 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20021220112100 its reverse (121102212002), we get a palindrome (20142322324102).

The spelling of 20021220112100 in words is "twenty trillion, twenty-one billion, two hundred twenty million, one hundred twelve thousand, one hundred".