72131121215 has 16 divisors (see below), whose sum is σ = 90334821888. Its totient is φ = 55187363616.

The previous prime is 72131121197. The next prime is 72131121241. The reversal of 72131121215 is 51212113127.

It is a happy number.

It is not a de Polignac number, because 72131121215 - 2⁶ = 72131121151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745982 + ... + 837108.

It is an arithmetic number, because the mean of its divisors is an integer number (5645926368).

Almost surely, 2^72131121215 is an apocalyptic number.

72131121215 is a deficient number, since it is larger than the sum of its proper divisors (18203700673).

72131121215 is a wasteful number, since it uses less digits than its factorization.

72131121215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98038.

The product of its digits is 840, while the sum is 26.

The spelling of 72131121215 in words is "seventy-two billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred fifteen".