21464604421 has 32 divisors (see below), whose sum is σ = 24373217792. Its totient is φ = 18772508160.

The previous prime is 21464604401. The next prime is 21464604439. The reversal of 21464604421 is 12440646412.

It is a cyclic number.

It is not a de Polignac number, because 21464604421 - 2²³ = 21456215813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464604401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2484916 + ... + 2493538.

It is an arithmetic number, because the mean of its divisors is an integer number (761663056).

Almost surely, 2^21464604421 is an apocalyptic number.

It is an amenable number.

21464604421 is a deficient number, since it is larger than the sum of its proper divisors (2908613371).

21464604421 is a wasteful number, since it uses less digits than its factorization.

21464604421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8813.

The product of its (nonzero) digits is 36864, while the sum is 34.

The spelling of 21464604421 in words is "twenty-one billion, four hundred sixty-four million, six hundred four thousand, four hundred twenty-one".