21514331220 has 24 divisors (see below), whose sum is σ = 60240127584. Its totient is φ = 5737154976.

The previous prime is 21514331197. The next prime is 21514331269. The reversal of 21514331220 is 2213341512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179286034 + ... + 179286153.

It is an arithmetic number, because the mean of its divisors is an integer number (2510005316).

Almost surely, 2^21514331220 is an apocalyptic number.

21514331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21514331220 is an abundant number, since it is smaller than the sum of its proper divisors (38725796364).

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

21514331220 is a wasteful number, since it uses less digits than its factorization.

21514331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358572199 (or 358572197 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21514331220 its reverse (2213341512), we get a palindrome (23727672732).

The spelling of 21514331220 in words is "twenty-one billion, five hundred fourteen million, three hundred thirty-one thousand, two hundred twenty".