21623535335421 has 12 divisors (see below), whose sum is σ = 31255056862848. Its totient is φ = 14405969587464.

The previous prime is 21623535335357. The next prime is 21623535335431. The reversal of 21623535335421 is 12453353532612.

21623535335421 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 3 + 53 + 53 + 3 + 542 + 1 = 666.

It is not a de Polignac number, because 21623535335421 - 2⁶ = 21623535335357 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623535335431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 810038925 + ... + 810065618.

It is an arithmetic number, because the mean of its divisors is an integer number (2604588071904).

Almost surely, 2^{21623535335421} is an apocalyptic number.

It is an amenable number.

21623535335421 is a deficient number, since it is larger than the sum of its proper divisors (9631521527427).

21623535335421 is a wasteful number, since it uses less digits than its factorization.

21623535335421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620106032 (or 1620106029 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 45.

The spelling of 21623535335421 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred thirty-five million, three hundred thirty-five thousand, four hundred twenty-one".