72075622021 has 4 divisors (see below), whose sum is σ = 77619900652. Its totient is φ = 66531343392.

The previous prime is 72075621997. The next prime is 72075622039. The reversal of 72075622021 is 12022657027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12022657027 = 11969 ⋅1004483.

It can be written as a sum of positive squares in 2 ways, for example, as 33065421921 + 39010200100 = 181839^2 + 197510^2 .

It is a cyclic number.

It is not a de Polignac number, because 72075622021 - 2¹⁵ = 72075589253 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 (72075622621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2772139296 + ... + 2772139321.

It is an arithmetic number, because the mean of its divisors is an integer number (19404975163).

Almost surely, 2^72075622021 is an apocalyptic number.

It is an amenable number.

72075622021 is a deficient number, since it is larger than the sum of its proper divisors (5544278631).

72075622021 is a wasteful number, since it uses less digits than its factorization.

72075622021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544278630.

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 72075622021 in words is "seventy-two billion, seventy-five million, six hundred twenty-two thousand, twenty-one".