51213020 has 12 divisors (see below), whose sum is σ = 107547384. Its totient is φ = 20485200.

The previous prime is 51213011. The next prime is 51213031. The reversal of 51213020 is 2031215.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51212986 and 51213004.

It is a congruent number.

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, 1280306 + ... + 1280345.

It is an arithmetic number, because the mean of its divisors is an integer number (8962282).

Almost surely, 2^51213020 is an apocalyptic number.

It is an amenable number.

51213020 is an abundant number, since it is smaller than the sum of its proper divisors (56334364).

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

51213020 is a wasteful number, since it uses less digits than its factorization.

51213020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560660 (or 2560658 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 51213020 is about 7156.3272703252. The cubic root of 51213020 is about 371.3585797956.

Adding to 51213020 its reverse (2031215), we get a palindrome (53244235).

The spelling of 51213020 in words is "fifty-one million, two hundred thirteen thousand, twenty".