21640411464 has 64 divisors (see below), whose sum is σ = 61854243840. Its totient is φ = 6180525120.

The previous prime is 21640411439. The next prime is 21640411483. The reversal of 21640411464 is 46411404612.

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 15 ways as a sum of consecutive naturals, for example, 423199 + ... + 471569.

It is an arithmetic number, because the mean of its divisors is an integer number (966472560).

Almost surely, 2^21640411464 is an apocalyptic number.

21640411464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21640411464 is an abundant number, since it is smaller than the sum of its proper divisors (40213832376).

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

21640411464 is a wasteful number, since it uses less digits than its factorization.

21640411464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51050 (or 51046 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 21640411464 in words is "twenty-one billion, six hundred forty million, four hundred eleven thousand, four hundred sixty-four".