72243387151321 has 27 divisors (see below), whose sum is σ = 74935692599733. Its totient is φ = 69645472549560.

The previous prime is 72243387151303. The next prime is 72243387151343. The reversal of 72243387151321 is 12315178334227.

The square root of 72243387151321 is 8499611.

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

It is not a de Polignac number, because 72243387151321 - 2¹⁷ = 72243387020249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72243387151421) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 128318626986 + ... + 128318627548.

Almost surely, 2^{72243387151321} is an apocalyptic number.

72243387151321 is the 8499611-st square number.

72243387151321 is the 4249806-th centered octagonal number.

It is an amenable number.

72243387151321 is a deficient number, since it is larger than the sum of its proper divisors (2692305448412).

72243387151321 is an frugal number, since it uses more digits than its factorization.

72243387151321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162 (or 1081 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 49.

The spelling of 72243387151321 in words is "seventy-two trillion, two hundred forty-three billion, three hundred eighty-seven million, one hundred fifty-one thousand, three hundred twenty-one".