15722401321 has 9 divisors (see below), whose sum is σ = 17283163933. Its totient is φ = 14291838220.

The previous prime is 15722401297. The next prime is 15722401337. The reversal of 15722401321 is 12310422751.

The square root of 15722401321 is 125389.

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

It is not a de Polignac number, because 15722401321 - 2²¹ = 15720304169 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 15722401321.

It is not an unprimeable number, because it can be changed into a prime (15722401421) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1373580 + ... + 1384978.

Almost surely, 2^15722401321 is an apocalyptic number.

15722401321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15722401321 is the 125389-th square number.

15722401321 is the 62695-th centered octagonal number.

It is an amenable number.

15722401321 is a deficient number, since it is larger than the sum of its proper divisors (1560762612).

15722401321 is an frugal number, since it uses more digits than its factorization.

15722401321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22820 (or 11410 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The spelling of 15722401321 in words is "fifteen billion, seven hundred twenty-two million, four hundred one thousand, three hundred twenty-one".