72023421921137 has 6 divisors (see below), whose sum is σ = 72901628843682. Its totient is φ = 71155669842992.

The previous prime is 72023421921109. The next prime is 72023421921163. The reversal of 72023421921137 is 73112912432027.

It can be written as a sum of positive squares in only one way, i.e., 54571447788001 + 17451974133136 = 7387249^2 + 4177556^2 .

It is not a de Polignac number, because 72023421921137 - 2⁸ = 72023421920881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72023421921107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5227415228 + ... + 5227429005.

It is an arithmetic number, because the mean of its divisors is an integer number (12150271473947).

Almost surely, 2^{72023421921137} is an apocalyptic number.

It is an amenable number.

72023421921137 is a deficient number, since it is larger than the sum of its proper divisors (878206922545).

72023421921137 is an equidigital number, since it uses as much as digits as its factorization.

72023421921137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10454844399 (or 10454844316 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 72023421921137 in words is "seventy-two trillion, twenty-three billion, four hundred twenty-one million, nine hundred twenty-one thousand, one hundred thirty-seven".