21011220002112 has 28 divisors (see below), whose sum is σ = 55592186256096. Its totient is φ = 7003740000640.

The previous prime is 21011220002093. The next prime is 21011220002191. The reversal of 21011220002112 is 21120002211012.

It is a junction number, because it is equal to n+sod(n) for n = 21011220002091 and 21011220002100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54716718564 + ... + 54716718947.

It is an arithmetic number, because the mean of its divisors is an integer number (1985435223432).

Almost surely, 2^{21011220002112} is an apocalyptic number.

It is an amenable number.

21011220002112 is an abundant number, since it is smaller than the sum of its proper divisors (34580966253984).

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

21011220002112 is a wasteful number, since it uses less digits than its factorization.

21011220002112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109433437526 (or 109433437516 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21011220002112 its reverse (21120002211012), we get a palindrome (42131222213124).

The spelling of 21011220002112 in words is "twenty-one trillion, eleven billion, two hundred twenty million, two thousand, one hundred twelve".