51212120 has 64 divisors (see below), whose sum is σ = 118752480. Its totient is φ = 19869696.

The previous prime is 51212101. The next prime is 51212131. The reversal of 51212120 is 2121215.

It is a junction number, because it is equal to n+sod(n) for n = 51212095 and 51212104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259862 + ... + 260058.

Almost surely, 2^51212120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59376240).

51212120 is an abundant number, since it is smaller than the sum of its proper divisors (67540360).

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

51212120 is a wasteful number, since it uses less digits than its factorization.

51212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 51212120 is about 7156.2643886318. The cubic root of 51212120 is about 371.3564044069.

Adding to 51212120 its reverse (2121215), we get a palindrome (53333335).

The spelling of 51212120 in words is "fifty-one million, two hundred twelve thousand, one hundred twenty".