15421320655 has 32 divisors (see below), whose sum is σ = 20381695488. Its totient is φ = 11132035200.

The previous prime is 15421320647. The next prime is 15421320659. The reversal of 15421320655 is 55602312451.

It is not a de Polignac number, because 15421320655 - 2³ = 15421320647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15421320655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421320659) 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, 556990 + ... + 584020.

It is an arithmetic number, because the mean of its divisors is an integer number (636927984).

Almost surely, 2^15421320655 is an apocalyptic number.

15421320655 is a deficient number, since it is larger than the sum of its proper divisors (4960374833).

15421320655 is a wasteful number, since it uses less digits than its factorization.

15421320655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27247.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 15421320655 in words is "fifteen billion, four hundred twenty-one million, three hundred twenty thousand, six hundred fifty-five".