51421200 has 120 divisors (see below), whose sum is σ = 167260128. Its totient is φ = 13501440.

The previous prime is 51421193. The next prime is 51421213. The reversal of 51421200 is 212415.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 51421200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87307 + ... + 87893.

Almost surely, 2^51421200 is an apocalyptic number.

51421200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51421200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83630064).

51421200 is an abundant number, since it is smaller than the sum of its proper divisors (115838928).

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

51421200 is a wasteful number, since it uses less digits than its factorization.

51421200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 51421200 is about 7170.8576892865. The cubic root of 51421200 is about 371.8610881503.

Adding to 51421200 its reverse (212415), we get a palindrome (51633615).

The spelling of 51421200 in words is "fifty-one million, four hundred twenty-one thousand, two hundred".