51212100 has 36 divisors (see below), whose sum is σ = 148174544. Its totient is φ = 13656480.

The previous prime is 51212081. The next prime is 51212101. The reversal of 51212100 is 121215.

51212100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (51212101) 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 11 ways as a sum of consecutive naturals, for example, 85054 + ... + 85653.

Almost surely, 2^51212100 is an apocalyptic number.

51212100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51212100 is an abundant number, since it is smaller than the sum of its proper divisors (96962444).

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

51212100 is a wasteful number, since it uses less digits than its factorization.

51212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170724 (or 170717 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 51212100 is about 7156.2629912546. The cubic root of 51212100 is about 371.3563560646.

Adding to 51212100 its reverse (121215), we get a palindrome (51333315).

The spelling of 51212100 in words is "fifty-one million, two hundred twelve thousand, one hundred".