15421216764 has 24 divisors (see below), whose sum is σ = 36819650560. Its totient is φ = 5020861104.

The previous prime is 15421216763. The next prime is 15421216787. The reversal of 15421216764 is 46761212451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421216763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14942524 + ... + 14943555.

Almost surely, 2^15421216764 is an apocalyptic number.

It is an amenable number.

15421216764 is an abundant number, since it is smaller than the sum of its proper divisors (21398433796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15421216764 is a wasteful number, since it uses less digits than its factorization.

15421216764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29886129 (or 29886127 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The spelling of 15421216764 in words is "fifteen billion, four hundred twenty-one million, two hundred sixteen thousand, seven hundred sixty-four".