21210111320 has 16 divisors (see below), whose sum is σ = 47722750560. Its totient is φ = 8484044512.

The previous prime is 21210111311. The next prime is 21210111337. The reversal of 21210111320 is 2311101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210111295 and 21210111304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265126352 + ... + 265126431.

It is an arithmetic number, because the mean of its divisors is an integer number (2982671910).

Almost surely, 2^21210111320 is an apocalyptic number.

21210111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210111320 is an abundant number, since it is smaller than the sum of its proper divisors (26512639240).

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

21210111320 is a wasteful number, since it uses less digits than its factorization.

21210111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530252794 (or 530252790 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21210111320 its reverse (2311101212), we get a palindrome (23521212532).

The spelling of 21210111320 in words is "twenty-one billion, two hundred ten million, one hundred eleven thousand, three hundred twenty".