21163502621 has 12 divisors (see below), whose sum is σ = 22394460672. Its totient is φ = 19997154504.

The previous prime is 21163502617. The next prime is 21163502629. The reversal of 21163502621 is 12620536112.

It is not a de Polignac number, because 21163502621 - 2² = 21163502617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163502629) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 61730 + ... + 214796.

It is an arithmetic number, because the mean of its divisors is an integer number (1866205056).

Almost surely, 2^21163502621 is an apocalyptic number.

It is an amenable number.

21163502621 is a deficient number, since it is larger than the sum of its proper divisors (1230958051).

21163502621 is a wasteful number, since it uses less digits than its factorization.

21163502621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153488 (or 153469 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 21163502621 in words is "twenty-one billion, one hundred sixty-three million, five hundred two thousand, six hundred twenty-one".