51213302232 has 64 divisors (see below), whose sum is σ = 129416849280. Its totient is φ = 16887209472.

The previous prime is 51213302209. The next prime is 51213302233. The reversal of 51213302232 is 23220331215.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213302233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1400323 + ... + 1436429.

It is an arithmetic number, because the mean of its divisors is an integer number (2022138270).

Almost surely, 2^51213302232 is an apocalyptic number.

It is an amenable number.

51213302232 is an abundant number, since it is smaller than the sum of its proper divisors (78203547048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51213302232 is a wasteful number, since it uses less digits than its factorization.

51213302232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36752 (or 36748 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 51213302232 its reverse (23220331215), we get a palindrome (74433633447).

The spelling of 51213302232 in words is "fifty-one billion, two hundred thirteen million, three hundred two thousand, two hundred thirty-two".