72331353021 has 16 divisors (see below), whose sum is σ = 100443397248. Its totient is φ = 46256817600.

The previous prime is 72331353019. The next prime is 72331353037. The reversal of 72331353021 is 12035313327.

It is not a de Polignac number, because 72331353021 - 2¹ = 72331353019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72331353021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72331353071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4581090 + ... + 4596851.

It is an arithmetic number, because the mean of its divisors is an integer number (6277712328).

Almost surely, 2^72331353021 is an apocalyptic number.

72331353021 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

72331353021 is a deficient number, since it is larger than the sum of its proper divisors (28112044227).

72331353021 is a wasteful number, since it uses less digits than its factorization.

72331353021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9178052.

The product of its (nonzero) digits is 11340, while the sum is 30.

Adding to 72331353021 its reverse (12035313327), we get a palindrome (84366666348).

The spelling of 72331353021 in words is "seventy-two billion, three hundred thirty-one million, three hundred fifty-three thousand, twenty-one".