72723070021 has 4 divisors (see below), whose sum is σ = 83112080032. Its totient is φ = 62334060012.

The previous prime is 72723070003. The next prime is 72723070027. The reversal of 72723070021 is 12007032727.

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 not a de Polignac number, because 72723070021 - 2⁵ = 72723069989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72723070027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5194504995 + ... + 5194505008.

It is an arithmetic number, because the mean of its divisors is an integer number (20778020008).

Almost surely, 2^72723070021 is an apocalyptic number.

It is an amenable number.

72723070021 is a deficient number, since it is larger than the sum of its proper divisors (10389010011).

72723070021 is a wasteful number, since it uses less digits than its factorization.

72723070021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10389010010.

The product of its (nonzero) digits is 8232, while the sum is 31.

The spelling of 72723070021 in words is "seventy-two billion, seven hundred twenty-three million, seventy thousand, twenty-one".