21163456424 has 32 divisors (see below), whose sum is σ = 44344722240. Its totient is φ = 9385123200.

The previous prime is 21163456399. The next prime is 21163456427. The reversal of 21163456424 is 42465436112.

It is not an unprimeable number, because it can be changed into a prime (21163456427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2929244 + ... + 2936459.

It is an arithmetic number, because the mean of its divisors is an integer number (1385772570).

Almost surely, 2^21163456424 is an apocalyptic number.

It is an amenable number.

21163456424 is an abundant number, since it is smaller than the sum of its proper divisors (23181265816).

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

21163456424 is a wasteful number, since it uses less digits than its factorization.

21163456424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5865761 (or 5865757 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The spelling of 21163456424 in words is "twenty-one billion, one hundred sixty-three million, four hundred fifty-six thousand, four hundred twenty-four".