21423654162765 has 96 divisors (see below), whose sum is σ = 39336478272000. Its totient is φ = 11180727074304.

The previous prime is 21423654162731. The next prime is 21423654162769. The reversal of 21423654162765 is 56726145632412.

It is a happy number.

21423654162765 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 3 + 6 + 5 + 4 + 1 + 627 + 6 + 5 = 666.

It is not a de Polignac number, because 21423654162765 - 2²⁰ = 21423653114189 is a prime.

It is a super-2 number, since 2×21423654162765² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423654162769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 328264017 + ... + 328329273.

It is an arithmetic number, because the mean of its divisors is an integer number (409754982000).

Almost surely, 2^{21423654162765} is an apocalyptic number.

It is an amenable number.

21423654162765 is a deficient number, since it is larger than the sum of its proper divisors (17912824109235).

21423654162765 is an equidigital number, since it uses as much as digits as its factorization.

21423654162765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71073 (or 71061 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The spelling of 21423654162765 in words is "twenty-one trillion, four hundred twenty-three billion, six hundred fifty-four million, one hundred sixty-two thousand, seven hundred sixty-five".