51221334512 has 20 divisors (see below), whose sum is σ = 103556177040. Its totient is φ = 24497159808.

The previous prime is 51221334511. The next prime is 51221334539. The reversal of 51221334512 is 21543312215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221334511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69593837 + ... + 69594572.

It is an arithmetic number, because the mean of its divisors is an integer number (5177808852).

Almost surely, 2^51221334512 is an apocalyptic number.

It is an amenable number.

51221334512 is an abundant number, since it is smaller than the sum of its proper divisors (52334842528).

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

51221334512 is a wasteful number, since it uses less digits than its factorization.

51221334512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139188440 (or 139188434 counting only the distinct ones).

The product of its digits is 7200, while the sum is 29.

Adding to 51221334512 its reverse (21543312215), we get a palindrome (72764646727).

The spelling of 51221334512 in words is "fifty-one billion, two hundred twenty-one million, three hundred thirty-four thousand, five hundred twelve".