21311211110 has 64 divisors (see below), whose sum is σ = 46193172480. Its totient is φ = 6915300480.

The previous prime is 21311211109. The next prime is 21311211133. The reversal of 21311211110 is 1111211312.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1438340 + ... + 1453080.

It is an arithmetic number, because the mean of its divisors is an integer number (721768320).

Almost surely, 2^21311211110 is an apocalyptic number.

21311211110 is an abundant number, since it is smaller than the sum of its proper divisors (24881961370).

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

21311211110 is a wasteful number, since it uses less digits than its factorization.

21311211110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15861.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21311211110 its reverse (1111211312), we get a palindrome (22422422422).

The spelling of 21311211110 in words is "twenty-one billion, three hundred eleven million, two hundred eleven thousand, one hundred ten".