15421264621 has 32 divisors (see below), whose sum is σ = 19057794048. Its totient is φ = 12177285120.

The previous prime is 15421264609. The next prime is 15421264657. The reversal of 15421264621 is 12646212451.

It is not a de Polignac number, because 15421264621 - 2⁷ = 15421264493 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 (15421264121) 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, 2917501 + ... + 2922781.

It is an arithmetic number, because the mean of its divisors is an integer number (595556064).

Almost surely, 2^15421264621 is an apocalyptic number.

It is an amenable number.

15421264621 is a deficient number, since it is larger than the sum of its proper divisors (3636529427).

15421264621 is a wasteful number, since it uses less digits than its factorization.

15421264621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5821.

The product of its digits is 23040, while the sum is 34.

The spelling of 15421264621 in words is "fifteen billion, four hundred twenty-one million, two hundred sixty-four thousand, six hundred twenty-one".