51167421 has 12 divisors (see below), whose sum is σ = 74474400. Its totient is φ = 33850440.

The previous prime is 51167393. The next prime is 51167447. The reversal of 51167421 is 12476115.

It is a happy number.

It is not a de Polignac number, because 51167421 - 2⁹ = 51166909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51167461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20521 + ... + 22878.

It is an arithmetic number, because the mean of its divisors is an integer number (6206200).

Almost surely, 2^51167421 is an apocalyptic number.

It is an amenable number.

51167421 is a deficient number, since it is larger than the sum of its proper divisors (23306979).

51167421 is a wasteful number, since it uses less digits than its factorization.

51167421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43536 (or 43533 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 51167421 is about 7153.1406389082. The cubic root of 51167421 is about 371.2483304350.

The spelling of 51167421 in words is "fifty-one million, one hundred sixty-seven thousand, four hundred twenty-one".