21325555320 has 64 divisors (see below), whose sum is σ = 65705778720. Its totient is φ = 5533115904.

The previous prime is 21325555319. The next prime is 21325555337. The reversal of 21325555320 is 2355552312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2397087 + ... + 2405966.

Almost surely, 2^21325555320 is an apocalyptic number.

21325555320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21325555320 is an abundant number, since it is smaller than the sum of its proper divisors (44380223400).

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

21325555320 is a wasteful number, since it uses less digits than its factorization.

21325555320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4803104 (or 4803100 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 21325555320 in words is "twenty-one billion, three hundred twenty-five million, five hundred fifty-five thousand, three hundred twenty".