21999512960 has 64 divisors (see below), whose sum is σ = 53113460400. Its totient is φ = 8712652800.

The previous prime is 21999512939. The next prime is 21999512981. The reversal of 21999512960 is 6921599912.

It is an interprime number because it is at equal distance from previous prime (21999512939) and next prime (21999512981).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 105530 + ... + 234809.

Almost surely, 2^21999512960 is an apocalyptic number.

21999512960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21999512960 is an abundant number, since it is smaller than the sum of its proper divisors (31113947440).

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

21999512960 is a wasteful number, since it uses less digits than its factorization.

21999512960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340459 (or 340447 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 53.

It can be divided in two parts, 2199 and 9512960, that added together give a palindrome (9515159).

The spelling of 21999512960 in words is "twenty-one billion, nine hundred ninety-nine million, five hundred twelve thousand, nine hundred sixty".