72002049945021 has 24 divisors (see below), whose sum is σ = 122959165754880. Its totient is φ = 39725268934176.

The previous prime is 72002049944947. The next prime is 72002049945037. The reversal of 72002049945021 is 12054994020027.

72002049945021 is a `hidden beast` number, since 72 + 0 + 0 + 20 + 4 + 99 + 450 + 21 = 666.

It is not a de Polignac number, because 72002049945021 - 2²⁷ = 72001915727293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72002049945061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19704992685 + ... + 19704996338.

It is an arithmetic number, because the mean of its divisors is an integer number (5123298573120).

Almost surely, 2^{72002049945021} is an apocalyptic number.

It is an amenable number.

72002049945021 is a deficient number, since it is larger than the sum of its proper divisors (50957115809859).

72002049945021 is a wasteful number, since it uses less digits than its factorization.

72002049945021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39409989065 (or 39409989062 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 72002049945021 in words is "seventy-two trillion, two billion, forty-nine million, nine hundred forty-five thousand, twenty-one".