21661165732430 has 32 divisors (see below), whose sum is σ = 44573378734080. Its totient is φ = 7424474332320.

The previous prime is 21661165732429. The next prime is 21661165732447. The reversal of 21661165732430 is 3423756116612.

It is a super-2 number, since 2×21661165732430² (a number of 27 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 15 ways as a sum of consecutive naturals, for example, 45826976 + ... + 46297235.

It is an arithmetic number, because the mean of its divisors is an integer number (1392918085440).

Almost surely, 2^{21661165732430} is an apocalyptic number.

21661165732430 is an abundant number, since it is smaller than the sum of its proper divisors (22912213001650).

21661165732430 is a wasteful number, since it uses less digits than its factorization.

21661165732430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92127584.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 21661165732430 in words is "twenty-one trillion, six hundred sixty-one billion, one hundred sixty-five million, seven hundred thirty-two thousand, four hundred thirty".