21300021960 has 64 divisors (see below), whose sum is σ = 73028649600. Its totient is φ = 4868576256.

The previous prime is 21300021959. The next prime is 21300022001. The reversal of 21300021960 is 6912000312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21300021960.

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, 12677745 + ... + 12679424.

It is an arithmetic number, because the mean of its divisors is an integer number (1141072650).

Almost surely, 2^21300021960 is an apocalyptic number.

21300021960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21300021960 is an abundant number, since it is smaller than the sum of its proper divisors (51728627640).

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

21300021960 is a wasteful number, since it uses less digits than its factorization.

21300021960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25357190 (or 25357186 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The spelling of 21300021960 in words is "twenty-one billion, three hundred million, twenty-one thousand, nine hundred sixty".