72123011321 has 8 divisors (see below), whose sum is σ = 72892124544. Its totient is φ = 71354977200.

The previous prime is 72123011263. The next prime is 72123011347. The reversal of 72123011321 is 12311032127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72123011321 - 2³⁰ = 71049269497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72123011371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135035 + ... + 403088.

It is an arithmetic number, because the mean of its divisors is an integer number (9111515568).

Almost surely, 2^72123011321 is an apocalyptic number.

It is an amenable number.

72123011321 is a deficient number, since it is larger than the sum of its proper divisors (769113223).

72123011321 is a wasteful number, since it uses less digits than its factorization.

72123011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539551.

The product of its (nonzero) digits is 504, while the sum is 23.

Adding to 72123011321 its reverse (12311032127), we get a palindrome (84434043448).

The spelling of 72123011321 in words is "seventy-two billion, one hundred twenty-three million, eleven thousand, three hundred twenty-one".