21590324166 has 16 divisors (see below), whose sum is σ = 44184849984. Its totient is φ = 7029407784.

The previous prime is 21590324143. The next prime is 21590324191. The reversal of 21590324166 is 66142309512.

It is a super-2 number, since 2×21590324166² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 41841456 + ... + 41841971.

It is an arithmetic number, because the mean of its divisors is an integer number (2761553124).

Almost surely, 2^21590324166 is an apocalyptic number.

21590324166 is an abundant number, since it is smaller than the sum of its proper divisors (22594525818).

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

21590324166 is a wasteful number, since it uses less digits than its factorization.

21590324166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83683475.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 21590324166 in words is "twenty-one billion, five hundred ninety million, three hundred twenty-four thousand, one hundred sixty-six".