21315532300 has 18 divisors (see below), whose sum is σ = 46254705308. Its totient is φ = 8526212880.

The previous prime is 21315532253. The next prime is 21315532313. The reversal of 21315532300 is 323551312.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106577562 + ... + 106577761.

Almost surely, 2^21315532300 is an apocalyptic number.

21315532300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21315532300 is an abundant number, since it is smaller than the sum of its proper divisors (24939173008).

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

21315532300 is a wasteful number, since it uses less digits than its factorization.

21315532300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213155337 (or 213155330 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The spelling of 21315532300 in words is "twenty-one billion, three hundred fifteen million, five hundred thirty-two thousand, three hundred".