51212122320 has 80 divisors (see below), whose sum is σ = 158837333760. Its totient is φ = 13649705472.

The previous prime is 51212122303. The next prime is 51212122369. The reversal of 51212122320 is 2322121215.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434377 + ... + 539543.

It is an arithmetic number, because the mean of its divisors is an integer number (1985466672).

Almost surely, 2^51212122320 is an apocalyptic number.

It is an amenable number.

51212122320 is an abundant number, since it is smaller than the sum of its proper divisors (107625211440).

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

51212122320 is a wasteful number, since it uses less digits than its factorization.

51212122320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107212 (or 107206 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 51212122320 its reverse (2322121215), we get a palindrome (53534243535).

The spelling of 51212122320 in words is "fifty-one billion, two hundred twelve million, one hundred twenty-two thousand, three hundred twenty".