51210251212 has 12 divisors (see below), whose sum is σ = 90752344480. Its totient is φ = 25281009936.

The previous prime is 51210251207. The next prime is 51210251221. The reversal of 51210251212 is 21215201215.

It is a happy number.

It is a super-2 number, since 2×51210251212² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81028563 + ... + 81029194.

Almost surely, 2^51210251212 is an apocalyptic number.

It is an amenable number.

51210251212 is a deficient number, since it is larger than the sum of its proper divisors (39542093268).

51210251212 is a wasteful number, since it uses less digits than its factorization.

51210251212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162057840 (or 162057838 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 51210251212 its reverse (21215201215), we get a palindrome (72425452427).

The spelling of 51210251212 in words is "fifty-one billion, two hundred ten million, two hundred fifty-one thousand, two hundred twelve".