72192107521 has 2 divisors, whose sum is σ = 72192107522. Its totient is φ = 72192107520.

The previous prime is 72192107513. The next prime is 72192107539. The reversal of 72192107521 is 12570129127.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68453396496 + 3738711025 = 261636^2 + 61145^2 .

It is an emirp because it is prime and its reverse (12570129127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72192107521 - 2³ = 72192107513 is a prime.

It is not a weakly prime, because it can be changed into another prime (72192107501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36096053760 + 36096053761.

It is an arithmetic number, because the mean of its divisors is an integer number (36096053761).

Almost surely, 2^72192107521 is an apocalyptic number.

It is an amenable number.

72192107521 is a deficient number, since it is larger than the sum of its proper divisors (1).

72192107521 is an equidigital number, since it uses as much as digits as its factorization.

72192107521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 37.

The spelling of 72192107521 in words is "seventy-two billion, one hundred ninety-two million, one hundred seven thousand, five hundred twenty-one".