51428421 has 36 divisors (see below), whose sum is σ = 85587840. Its totient is φ = 29507760.

The previous prime is 51428407. The next prime is 51428423. The reversal of 51428421 is 12482415.

It is not a de Polignac number, because 51428421 - 2⁵ = 51428389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51428423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35020 + ... + 36458.

It is an arithmetic number, because the mean of its divisors is an integer number (2377440).

Almost surely, 2^51428421 is an apocalyptic number.

It is an amenable number.

51428421 is a deficient number, since it is larger than the sum of its proper divisors (34159419).

51428421 is a wasteful number, since it uses less digits than its factorization.

51428421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494 (or 1472 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 51428421 is about 7171.3611678676. The cubic root of 51428421 is about 371.8784939624.

The spelling of 51428421 in words is "fifty-one million, four hundred twenty-eight thousand, four hundred twenty-one".