72271534321 has 4 divisors (see below), whose sum is σ = 82596039232. Its totient is φ = 61947029412.

The previous prime is 72271534277. The next prime is 72271534331. The reversal of 72271534321 is 12343517227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72271534321 - 2¹¹ = 72271532273 is a prime.

It is a super-2 number, since 2×72271534321² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72271534331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5162252445 + ... + 5162252458.

It is an arithmetic number, because the mean of its divisors is an integer number (20649009808).

Almost surely, 2^72271534321 is an apocalyptic number.

It is an amenable number.

72271534321 is a deficient number, since it is larger than the sum of its proper divisors (10324504911).

72271534321 is a wasteful number, since it uses less digits than its factorization.

72271534321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10324504910.

The product of its digits is 70560, while the sum is 37.

The spelling of 72271534321 in words is "seventy-two billion, two hundred seventy-one million, five hundred thirty-four thousand, three hundred twenty-one".