51147421 has 16 divisors (see below), whose sum is σ = 56899584. Its totient is φ = 45679104.

The previous prime is 51147403. The next prime is 51147457. The reversal of 51147421 is 12474115.

51147421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51147421 - 2⁵ = 51147389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51147401) 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 15 ways as a sum of consecutive naturals, for example, 58836 + ... + 59698.

It is an arithmetic number, because the mean of its divisors is an integer number (3556224).

Almost surely, 2^51147421 is an apocalyptic number.

It is an amenable number.

51147421 is a deficient number, since it is larger than the sum of its proper divisors (5752163).

51147421 is a wasteful number, since it uses less digits than its factorization.

51147421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020.

The product of its digits is 1120, while the sum is 25.

The square root of 51147421 is about 7151.7425149400. The cubic root of 51147421 is about 371.1999537265.

The spelling of 51147421 in words is "fifty-one million, one hundred forty-seven thousand, four hundred twenty-one".