51021300 has 72 divisors (see below), whose sum is σ = 161052192. Its totient is φ = 12368000.

The previous prime is 51021241. The next prime is 51021307. The reversal of 51021300 is 312015.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4431 + ... + 11030.

It is an arithmetic number, because the mean of its divisors is an integer number (2236836).

Almost surely, 2^51021300 is an apocalyptic number.

51021300 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51021300 is an abundant number, since it is smaller than the sum of its proper divisors (110030892).

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

51021300 is a wasteful number, since it uses less digits than its factorization.

51021300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15489 (or 15482 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 51021300 is about 7142.9195711558. The cubic root of 51021300 is about 370.8945969005.

Adding to 51021300 its reverse (312015), we get a palindrome (51333315).

The spelling of 51021300 in words is "fifty-one million, twenty-one thousand, three hundred".