21311344120 has 32 divisors (see below), whose sum is σ = 52309663920. Its totient is φ = 7749579520.

The previous prime is 21311344099. The next prime is 21311344147. The reversal of 21311344120 is 2144311312.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21311344091 and 21311344100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24216997 + ... + 24217876.

Almost surely, 2^21311344120 is an apocalyptic number.

21311344120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311344120 is an abundant number, since it is smaller than the sum of its proper divisors (30998319800).

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

21311344120 is a wasteful number, since it uses less digits than its factorization.

21311344120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48434895 (or 48434891 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21311344120 its reverse (2144311312), we get a palindrome (23455655432).

The spelling of 21311344120 in words is "twenty-one billion, three hundred eleven million, three hundred forty-four thousand, one hundred twenty".