51211223312 has 40 divisors (see below), whose sum is σ = 101431008000. Its totient is φ = 25036535552.

The previous prime is 51211223251. The next prime is 51211223377. The reversal of 51211223312 is 21332211215.

It is a super-4 number, since 4×51211223312⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756389 + ... + 821307.

It is an arithmetic number, because the mean of its divisors is an integer number (2535775200).

Almost surely, 2^51211223312 is an apocalyptic number.

It is an amenable number.

51211223312 is a deficient number, since it is larger than the sum of its proper divisors (50219784688).

51211223312 is a wasteful number, since it uses less digits than its factorization.

51211223312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66023 (or 66017 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

Adding to 51211223312 its reverse (21332211215), we get a palindrome (72543434527).

The spelling of 51211223312 in words is "fifty-one billion, two hundred eleven million, two hundred twenty-three thousand, three hundred twelve".