51112212 has 12 divisors (see below), whose sum is σ = 119261856. Its totient is φ = 17037400.

The previous prime is 51112189. The next prime is 51112219. The reversal of 51112212 is 21221115.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×51112212² = 5224916431065888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51112191 and 51112200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51112219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2129664 + ... + 2129687.

It is an arithmetic number, because the mean of its divisors is an integer number (9938488).

Almost surely, 2^51112212 is an apocalyptic number.

It is an amenable number.

51112212 is an abundant number, since it is smaller than the sum of its proper divisors (68149644).

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

51112212 is a wasteful number, since it uses less digits than its factorization.

51112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4259358 (or 4259356 counting only the distinct ones).

The product of its digits is 40, while the sum is 15.

The square root of 51112212 is about 7149.2805232415. The cubic root of 51112212 is about 371.1147582985.

Adding to 51112212 its reverse (21221115), we get a palindrome (72333327).

The spelling of 51112212 in words is "fifty-one million, one hundred twelve thousand, two hundred twelve".