51321212 has 6 divisors (see below), whose sum is σ = 89812128. Its totient is φ = 25660604.

The previous prime is 51321203. The next prime is 51321241. The reversal of 51321212 is 21212315.

It is a happy number.

It is a super-2 number, since 2×51321212² = 5267733602297888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6415148 + ... + 6415155.

It is an arithmetic number, because the mean of its divisors is an integer number (14968688).

Almost surely, 2^51321212 is an apocalyptic number.

It is an amenable number.

51321212 is a deficient number, since it is larger than the sum of its proper divisors (38490916).

51321212 is a wasteful number, since it uses less digits than its factorization.

51321212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12830307 (or 12830305 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 51321212 is about 7163.8824669309. The cubic root of 51321212 is about 371.6199050564.

Adding to 51321212 its reverse (21212315), we get a palindrome (72533527).

The spelling of 51321212 in words is "fifty-one million, three hundred twenty-one thousand, two hundred twelve".