15478096921 has 15 divisors (see below), whose sum is σ = 18063819861. Its totient is φ = 13261714956.

The previous prime is 15478096871. The next prime is 15478096943. The reversal of 15478096921 is 12969087451.

The square root of 15478096921 is 124411.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 15478096921 - 2¹³ = 15478088729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15478096961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6094870 + ... + 6097408.

Almost surely, 2^15478096921 is an apocalyptic number.

15478096921 is the 124411-st square number.

15478096921 is the 62206-th centered octagonal number.

It is an amenable number.

15478096921 is a deficient number, since it is larger than the sum of its proper divisors (2585722940).

15478096921 is an frugal number, since it uses more digits than its factorization.

15478096921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106 (or 2546 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 15478096921 in words is "fifteen billion, four hundred seventy-eight million, ninety-six thousand, nine hundred twenty-one".