72124552021 has 8 divisors (see below), whose sum is σ = 72235002944. Its totient is φ = 72014171040.

The previous prime is 72124552013. The next prime is 72124552033. The reversal of 72124552021 is 12025542127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72124552021 - 2³ = 72124552013 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 (72124552091) 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 7 ways as a sum of consecutive naturals, for example, 2270776 + ... + 2302318.

It is an arithmetic number, because the mean of its divisors is an integer number (9029375368).

Almost surely, 2^72124552021 is an apocalyptic number.

It is an amenable number.

72124552021 is a deficient number, since it is larger than the sum of its proper divisors (110450923).

72124552021 is a wasteful number, since it uses less digits than its factorization.

72124552021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34971.

The product of its (nonzero) digits is 11200, while the sum is 31.

The spelling of 72124552021 in words is "seventy-two billion, one hundred twenty-four million, five hundred fifty-two thousand, twenty-one".