21266463960 has 96 divisors (see below), whose sum is σ = 78989732640. Its totient is φ = 4860905472.

The previous prime is 21266463923. The next prime is 21266463971. The reversal of 21266463960 is 6936466212.

21266463960 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 6 + 4 + 639 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 4217017 + ... + 4222056.

It is an arithmetic number, because the mean of its divisors is an integer number (822809715).

Almost surely, 2^21266463960 is an apocalyptic number.

21266463960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21266463960 is an abundant number, since it is smaller than the sum of its proper divisors (57723268680).

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

21266463960 is a wasteful number, since it uses less digits than its factorization.

21266463960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8439097 (or 8439090 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 21266463960 in words is "twenty-one billion, two hundred sixty-six million, four hundred sixty-three thousand, nine hundred sixty".