72531033535021 has 16 divisors (see below), whose sum is σ = 76824257013504. Its totient is φ = 68240779305984.

The previous prime is 72531033534929. The next prime is 72531033535031. The reversal of 72531033535021 is 12053533013527.

It is a cyclic number.

It is not a de Polignac number, because 72531033535021 - 2¹³ = 72531033526829 is a prime.

It is a super-3 number, since 3×72531033535021³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72531033535031) 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, 782744325 + ... + 782836981.

It is an arithmetic number, because the mean of its divisors is an integer number (4801516063344).

Almost surely, 2^{72531033535021} is an apocalyptic number.

It is an amenable number.

72531033535021 is a deficient number, since it is larger than the sum of its proper divisors (4293223478483).

72531033535021 is a wasteful number, since it uses less digits than its factorization.

72531033535021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108180.

The product of its (nonzero) digits is 283500, while the sum is 40.

Adding to 72531033535021 its reverse (12053533013527), we get a palindrome (84584566548548).

The spelling of 72531033535021 in words is "seventy-two trillion, five hundred thirty-one billion, thirty-three million, five hundred thirty-five thousand, twenty-one".