21020120321112 has 64 divisors (see below), whose sum is σ = 63697334313600. Its totient is φ = 6369733429920.

The previous prime is 21020120321041. The next prime is 21020120321141. The reversal of 21020120321112 is 21112302102012.

21020120321112 is a `hidden beast` number, since 2 + 10 + 201 + 20 + 321 + 112 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4423423618 + ... + 4423428369.

It is an arithmetic number, because the mean of its divisors is an integer number (995270848650).

Almost surely, 2^{21020120321112} is an apocalyptic number.

21020120321112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020120321112 is an abundant number, since it is smaller than the sum of its proper divisors (42677213992488).

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

21020120321112 is a wasteful number, since it uses less digits than its factorization.

21020120321112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8846852013 (or 8846852003 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21020120321112 its reverse (21112302102012), we get a palindrome (42132422423124).

The spelling of 21020120321112 in words is "twenty-one trillion, twenty billion, one hundred twenty million, three hundred twenty-one thousand, one hundred twelve".