51213012 has 24 divisors (see below), whose sum is σ = 119613312. Its totient is φ = 17054400.

The previous prime is 51213011. The next prime is 51213031. The reversal of 51213012 is 21031215.

51213012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51213012² = 5245545196224288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51212982 and 51213000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21312 + ... + 23592.

It is an arithmetic number, because the mean of its divisors is an integer number (4983888).

Almost surely, 2^51213012 is an apocalyptic number.

It is an amenable number.

51213012 is an abundant number, since it is smaller than the sum of its proper divisors (68400300).

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

51213012 is a wasteful number, since it uses less digits than its factorization.

51213012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159 (or 4157 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 51213012 is about 7156.3267113792. The cubic root of 51213012 is about 371.3585604589.

Adding to 51213012 its reverse (21031215), we get a palindrome (72244227).

The spelling of 51213012 in words is "fifty-one million, two hundred thirteen thousand, twelve".