51312021315 has 64 divisors (see below), whose sum is σ = 89932332672. Its totient is φ = 24879104000.

The previous prime is 51312021287. The next prime is 51312021317.

51312021315 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51312021315 - 2⁹ = 51312020803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51312021317) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1031659 + ... + 1080251.

It is an arithmetic number, because the mean of its divisors is an integer number (1405192698).

Almost surely, 2^51312021315 is an apocalyptic number.

51312021315 is a deficient number, since it is larger than the sum of its proper divisors (38620311357).

51312021315 is a wasteful number, since it uses less digits than its factorization.

51312021315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48760.

The product of its (nonzero) digits is 900, while the sum is 24.

It can be divided in two parts, 513120 and 21315, that added together give a palindrome (534435).

The spelling of 51312021315 in words is "fifty-one billion, three hundred twelve million, twenty-one thousand, three hundred fifteen".