21611317320502 has 128 divisors (see below), whose sum is σ = 41755875840000. Its totient is φ = 8158348864512.

The previous prime is 21611317320479. The next prime is 21611317320529. The reversal of 21611317320502 is 20502371311612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1211455699 + ... + 1211473537.

It is an arithmetic number, because the mean of its divisors is an integer number (326217780000).

Almost surely, 2^{21611317320502} is an apocalyptic number.

21611317320502 is a deficient number, since it is larger than the sum of its proper divisors (20144558519498).

21611317320502 is a wasteful number, since it uses less digits than its factorization.

21611317320502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20558.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21611317320502 in words is "twenty-one trillion, six hundred eleven billion, three hundred seventeen million, three hundred twenty thousand, five hundred two".