72101330321 has 4 divisors (see below), whose sum is σ = 75896137200. Its totient is φ = 68306523444.

The previous prime is 72101330303. The next prime is 72101330369. The reversal of 72101330321 is 12303310127.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72101330321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72101338321) 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, 1897403411 + ... + 1897403448.

It is an arithmetic number, because the mean of its divisors is an integer number (18974034300).

Almost surely, 2^72101330321 is an apocalyptic number.

It is an amenable number.

72101330321 is a deficient number, since it is larger than the sum of its proper divisors (3794806879).

72101330321 is a wasteful number, since it uses less digits than its factorization.

72101330321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3794806878.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 72101330321 its reverse (12303310127), we get a palindrome (84404640448).

The spelling of 72101330321 in words is "seventy-two billion, one hundred one million, three hundred thirty thousand, three hundred twenty-one".