72246921 has 4 divisors (see below), whose sum is σ = 96329232. Its totient is φ = 48164612.

The previous prime is 72246919. The next prime is 72246929. The reversal of 72246921 is 12964227.

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 72246921 - 2¹ = 72246919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72246929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12041151 + ... + 12041156.

It is an arithmetic number, because the mean of its divisors is an integer number (24082308).

Almost surely, 2^72246921 is an apocalyptic number.

It is an amenable number.

72246921 is a deficient number, since it is larger than the sum of its proper divisors (24082311).

72246921 is a wasteful number, since it uses less digits than its factorization.

72246921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24082310.

The product of its digits is 12096, while the sum is 33.

The square root of 72246921 is about 8499.8188804233. The cubic root of 72246921 is about 416.4917927139.

The spelling of 72246921 in words is "seventy-two million, two hundred forty-six thousand, nine hundred twenty-one".