21321013120 has 96 divisors (see below), whose sum is σ = 56025680760. Its totient is φ = 7753067520.

The previous prime is 21321013099. The next prime is 21321013157. The reversal of 21321013120 is 2131012312.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21321013094 and 21321013103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60222 + ... + 215101.

Almost surely, 2^21321013120 is an apocalyptic number.

21321013120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321013120 is an abundant number, since it is smaller than the sum of its proper divisors (34704667640).

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

21321013120 is a wasteful number, since it uses less digits than its factorization.

21321013120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275364 (or 275341 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21321013120 its reverse (2131012312), we get a palindrome (23452025432).

The spelling of 21321013120 in words is "twenty-one billion, three hundred twenty-one million, thirteen thousand, one hundred twenty".