21121111110102 has 48 divisors (see below), whose sum is σ = 44174721608640. Its totient is φ = 6731174006160.

The previous prime is 21121111109951. The next prime is 21121111110103. The reversal of 21121111110102 is 20101111112112.

It is a super-2 number, since 2×21121111110102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121111110103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21587952 + ... + 22545107.

It is an arithmetic number, because the mean of its divisors is an integer number (920306700180).

Almost surely, 2^{21121111110102} is an apocalyptic number.

21121111110102 is an abundant number, since it is smaller than the sum of its proper divisors (23053610498538).

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

21121111110102 is a wasteful number, since it uses less digits than its factorization.

21121111110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44133209 (or 44133178 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21121111110102 its reverse (20101111112112), we get a palindrome (41222222222214).

The spelling of 21121111110102 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, one hundred two".