51213431532212 has 12 divisors (see below), whose sum is σ = 89628344331876. Its totient is φ = 25605333151680.

The previous prime is 51213431532199. The next prime is 51213431532269. The reversal of 51213431532212 is 21223513431215.

It can be written as a sum of positive squares in 2 ways, for example, as 31797035320996 + 19416396211216 = 5638886^2 + 4406404^2 .

It is a super-2 number, since 2×51213431532212² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345570263 + ... + 345718430.

It is an arithmetic number, because the mean of its divisors is an integer number (7469028694323).

Almost surely, 2^{51213431532212} is an apocalyptic number.

It is an amenable number.

51213431532212 is a deficient number, since it is larger than the sum of its proper divisors (38414912799664).

51213431532212 is a wasteful number, since it uses less digits than its factorization.

51213431532212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691307218 (or 691307216 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

Adding to 51213431532212 its reverse (21223513431215), we get a palindrome (72436944963427).

The spelling of 51213431532212 in words is "fifty-one trillion, two hundred thirteen billion, four hundred thirty-one million, five hundred thirty-two thousand, two hundred twelve".