51044421 has 16 divisors (see below), whose sum is σ = 72230400. Its totient is φ = 31953408.

The previous prime is 51044417. The next prime is 51044443. The reversal of 51044421 is 12444015.

It is a happy number.

It is not a de Polignac number, because 51044421 - 2² = 51044417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51044471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28140 + ... + 29898.

It is an arithmetic number, because the mean of its divisors is an integer number (4514400).

Almost surely, 2^51044421 is an apocalyptic number.

51044421 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51044421 is a deficient number, since it is larger than the sum of its proper divisors (21185979).

51044421 is a wasteful number, since it uses less digits than its factorization.

51044421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 51044421 is about 7144.5378436957. The cubic root of 51044421 is about 370.9506137597.

Adding to 51044421 its reverse (12444015), we get a palindrome (63488436).

The spelling of 51044421 in words is "fifty-one million, forty-four thousand, four hundred twenty-one".