21003629964 has 12 divisors (see below), whose sum is σ = 49008469944. Its totient is φ = 7001209984.

The previous prime is 21003629963. The next prime is 21003630013. The reversal of 21003629964 is 46992630012.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21003629963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875151237 + ... + 875151260.

It is an arithmetic number, because the mean of its divisors is an integer number (4084039162).

Almost surely, 2^21003629964 is an apocalyptic number.

It is an amenable number.

21003629964 is an abundant number, since it is smaller than the sum of its proper divisors (28004839980).

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

21003629964 is a wasteful number, since it uses less digits than its factorization.

21003629964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750302504 (or 1750302502 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 21003629964 in words is "twenty-one billion, three million, six hundred twenty-nine thousand, nine hundred sixty-four".