21660411522426 has 16 divisors (see below), whose sum is σ = 43350678901728. Its totient is φ = 7215161198000.

The previous prime is 21660411522401. The next prime is 21660411522461. The reversal of 21660411522426 is 62422511406612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1243984605 + ... + 1244002016.

It is an arithmetic number, because the mean of its divisors is an integer number (2709417431358).

Almost surely, 2^{21660411522426} is an apocalyptic number.

21660411522426 is an abundant number, since it is smaller than the sum of its proper divisors (21690267379302).

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

21660411522426 is a wasteful number, since it uses less digits than its factorization.

21660411522426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487988077.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 21660411522426 in words is "twenty-one trillion, six hundred sixty billion, four hundred eleven million, five hundred twenty-two thousand, four hundred twenty-six".