51321321534 has 32 divisors (see below), whose sum is σ = 123479873280. Its totient is φ = 13891485312.

The previous prime is 51321321529. The next prime is 51321321551. The reversal of 51321321534 is 43512312315.

It is a super-2 number, since 2×51321321534² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32155419 + ... + 32157014.

It is an arithmetic number, because the mean of its divisors is an integer number (3858746040).

Almost surely, 2^51321321534 is an apocalyptic number.

51321321534 is an abundant number, since it is smaller than the sum of its proper divisors (72158551746).

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

51321321534 is a wasteful number, since it uses less digits than its factorization.

51321321534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64312464.

The product of its digits is 10800, while the sum is 30.

Adding to 51321321534 its reverse (43512312315), we get a palindrome (94833633849).

The spelling of 51321321534 in words is "fifty-one billion, three hundred twenty-one million, three hundred twenty-one thousand, five hundred thirty-four".