21407737264 has 40 divisors (see below), whose sum is σ = 42037468160. Its totient is φ = 10559585088.

The previous prime is 21407737259. The next prime is 21407737303. The reversal of 21407737264 is 46273770412.

It is a self number, because there is not a number n which added to its sum of digits gives 21407737264.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1670947 + ... + 1683709.

It is an arithmetic number, because the mean of its divisors is an integer number (1050936704).

Almost surely, 2^21407737264 is an apocalyptic number.

It is an amenable number.

21407737264 is a deficient number, since it is larger than the sum of its proper divisors (20629730896).

21407737264 is a wasteful number, since it uses less digits than its factorization.

21407737264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14177 (or 14171 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 43.

The spelling of 21407737264 in words is "twenty-one billion, four hundred seven million, seven hundred thirty-seven thousand, two hundred sixty-four".