21874618468605 has 64 divisors (see below), whose sum is σ = 40610836942848. Its totient is φ = 9847048780800.

The previous prime is 21874618468589. The next prime is 21874618468613. The reversal of 21874618468605 is 50686481647812.

It is not a de Polignac number, because 21874618468605 - 2⁴ = 21874618468589 is a prime.

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, 19149984 + ... + 20260086.

It is an arithmetic number, because the mean of its divisors is an integer number (634544327232).

Almost surely, 2^{21874618468605} is an apocalyptic number.

It is an amenable number.

21874618468605 is a deficient number, since it is larger than the sum of its proper divisors (18736218474243).

21874618468605 is a wasteful number, since it uses less digits than its factorization.

21874618468605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112986.

The product of its (nonzero) digits is 123863040, while the sum is 66.

The spelling of 21874618468605 in words is "twenty-one trillion, eight hundred seventy-four billion, six hundred eighteen million, four hundred sixty-eight thousand, six hundred five".