72133621 has 12 divisors (see below), whose sum is σ = 85191456. Its totient is φ = 59828760.

The previous prime is 72133619. The next prime is 72133627. The reversal of 72133621 is 12633127.

It is not a de Polignac number, because 72133621 - 2¹ = 72133619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72133627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1366 + ... + 12088.

It is an arithmetic number, because the mean of its divisors is an integer number (7099288).

Almost surely, 2^72133621 is an apocalyptic number.

It is an amenable number.

72133621 is a deficient number, since it is larger than the sum of its proper divisors (13057835).

72133621 is a wasteful number, since it uses less digits than its factorization.

72133621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10792 (or 10761 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 72133621 is about 8493.1514174657. The cubic root of 72133621 is about 416.2739600898.

Adding to 72133621 its reverse (12633127), we get a palindrome (84766748).

The spelling of 72133621 in words is "seventy-two million, one hundred thirty-three thousand, six hundred twenty-one".