51213231215 has 8 divisors (see below), whose sum is σ = 61466612928. Its totient is φ = 40963428000.

The previous prime is 51213231197. The next prime is 51213231217.

51213231215 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51213231215 - 2²⁰ = 51212182639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213231217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 863036 + ... + 920465.

It is an arithmetic number, because the mean of its divisors is an integer number (7683326616).

Almost surely, 2^51213231215 is an apocalyptic number.

51213231215 is a deficient number, since it is larger than the sum of its proper divisors (10253381713).

51213231215 is a wasteful number, since it uses less digits than its factorization.

51213231215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789249.

The product of its digits is 1800, while the sum is 26.

The spelling of 51213231215 in words is "fifty-one billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred fifteen".