21311011110 has 96 divisors (see below), whose sum is σ = 52342536960. Its totient is φ = 5552252800.

The previous prime is 21311011109. The next prime is 21311011187. The reversal of 21311011110 is 1111011312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25400071 + ... + 25400909.

It is an arithmetic number, because the mean of its divisors is an integer number (545234760).

Almost surely, 2^21311011110 is an apocalyptic number.

21311011110 is an abundant number, since it is smaller than the sum of its proper divisors (31031525850).

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

21311011110 is a wasteful number, since it uses less digits than its factorization.

21311011110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 21311011110 its reverse (1111011312), we get a palindrome (22422022422).

The spelling of 21311011110 in words is "twenty-one billion, three hundred eleven million, eleven thousand, one hundred ten".