72265203121 has 4 divisors (see below), whose sum is σ = 73449878644. Its totient is φ = 71080527600.

The previous prime is 72265203113. The next prime is 72265203139. The reversal of 72265203121 is 12130256227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29618410000 + 42646793121 = 172100^2 + 206511^2 .

It is a cyclic number.

It is not a de Polignac number, because 72265203121 - 2³ = 72265203113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72265203821) 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, 592337670 + ... + 592337791.

It is an arithmetic number, because the mean of its divisors is an integer number (18362469661).

Almost surely, 2^72265203121 is an apocalyptic number.

It is an amenable number.

72265203121 is a deficient number, since it is larger than the sum of its proper divisors (1184675523).

72265203121 is a wasteful number, since it uses less digits than its factorization.

72265203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184675522.

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 72265203121 its reverse (12130256227), we get a palindrome (84395459348).

The spelling of 72265203121 in words is "seventy-two billion, two hundred sixty-five million, two hundred three thousand, one hundred twenty-one".