21120211320 has 64 divisors (see below), whose sum is σ = 68234533920. Its totient is φ = 5198820864.

The previous prime is 21120211267. The next prime is 21120211327. The reversal of 21120211320 is 2311202112.

It is a super-2 number, since 2×21120211320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21120211320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120211327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6767739 + ... + 6770858.

Almost surely, 2^21120211320 is an apocalyptic number.

21120211320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120211320 is an abundant number, since it is smaller than the sum of its proper divisors (47114322600).

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

21120211320 is a wasteful number, since it uses less digits than its factorization.

21120211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13538624 (or 13538620 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21120211320 its reverse (2311202112), we get a palindrome (23431413432).

The spelling of 21120211320 in words is "twenty-one billion, one hundred twenty million, two hundred eleven thousand, three hundred twenty".