21101212111112 has 16 divisors (see below), whose sum is σ = 45216883095360. Its totient is φ = 9043376619024.

The previous prime is 21101212111081. The next prime is 21101212111153. The reversal of 21101212111112 is 21111121210112.

It is a super-2 number, since 2×21101212111112² (a number of 27 digits) contains 22 as substring.

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, 188403679508 + ... + 188403679619.

It is an arithmetic number, because the mean of its divisors is an integer number (2826055193460).

Almost surely, 2^{21101212111112} is an apocalyptic number.

It is an amenable number.

21101212111112 is an abundant number, since it is smaller than the sum of its proper divisors (24115670984248).

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

21101212111112 is a wasteful number, since it uses less digits than its factorization.

21101212111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376807359140 (or 376807359136 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 21101212111112 its reverse (21111121210112), we get a palindrome (42212333321224).

The spelling of 21101212111112 in words is "twenty-one trillion, one hundred one billion, two hundred twelve million, one hundred eleven thousand, one hundred twelve".