21163980320 has 48 divisors (see below), whose sum is σ = 57142749888. Its totient is φ = 7256221440.

The previous prime is 21163980287. The next prime is 21163980349. The reversal of 21163980320 is 2308936112.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9447086 + ... + 9449325.

It is an arithmetic number, because the mean of its divisors is an integer number (1190473956).

Almost surely, 2^21163980320 is an apocalyptic number.

21163980320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21163980320 is an abundant number, since it is smaller than the sum of its proper divisors (35978769568).

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

21163980320 is a wasteful number, since it uses less digits than its factorization.

21163980320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18896433 (or 18896425 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 21163980320 in words is "twenty-one billion, one hundred sixty-three million, nine hundred eighty thousand, three hundred twenty".