21120202121112 has 48 divisors (see below), whose sum is σ = 57200933790000. Its totient is φ = 7040019819456.

The previous prime is 21120202121087. The next prime is 21120202121159. The reversal of 21120202121112 is 21112120202112.

21120202121112 is a `hidden beast` number, since 211 + 20 + 202 + 121 + 112 = 666.

It is a super-2 number, since 2×21120202121112² (a number of 27 digits) contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10692589 + ... + 12512867.

It is an arithmetic number, because the mean of its divisors is an integer number (1191686120625).

Almost surely, 2^{21120202121112} is an apocalyptic number.

It is an amenable number.

21120202121112 is an abundant number, since it is smaller than the sum of its proper divisors (36080731668888).

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

21120202121112 is a wasteful number, since it uses less digits than its factorization.

21120202121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981440 (or 1981433 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21120202121112 its reverse (21112120202112), we get a palindrome (42232322323224).

The spelling of 21120202121112 in words is "twenty-one trillion, one hundred twenty billion, two hundred two million, one hundred twenty-one thousand, one hundred twelve".