15903984321 has 27 divisors (see below), whose sum is σ = 23224896513. Its totient is φ = 10487390760.

The previous prime is 15903984311. The next prime is 15903984323. The reversal of 15903984321 is 12348930951.

It is a happy number.

The square root of 15903984321 is 126111.

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

15903984321 is a `hidden beast` number, since 1 + 590 + 39 + 8 + 4 + 3 + 21 = 666.

It is not a de Polignac number, because 15903984321 - 2⁷ = 15903984193 is a prime.

It is a super-2 number, since 2×15903984321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15903984323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 48048126 + ... + 48048456.

Almost surely, 2^15903984321 is an apocalyptic number.

15903984321 is the 126111-st square number.

15903984321 is the 63056-th centered octagonal number.

It is an amenable number.

15903984321 is a deficient number, since it is larger than the sum of its proper divisors (7320912192).

15903984321 is an frugal number, since it uses more digits than its factorization.

15903984321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 15903984321 in words is "fifteen billion, nine hundred three million, nine hundred eighty-four thousand, three hundred twenty-one".