56057421 has 12 divisors (see below), whose sum is σ = 86946432. Its totient is φ = 32032728.

The previous prime is 56057401. The next prime is 56057437. The reversal of 56057421 is 12475065.

It is not a de Polignac number, because 56057421 - 2⁷ = 56057293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56057401) 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, 190525 + ... + 190818.

It is an arithmetic number, because the mean of its divisors is an integer number (7245536).

Almost surely, 2^56057421 is an apocalyptic number.

It is an amenable number.

56057421 is a deficient number, since it is larger than the sum of its proper divisors (30889011).

56057421 is a wasteful number, since it uses less digits than its factorization.

56057421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381360 (or 381353 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 56057421 is about 7487.1503925058. The cubic root of 56057421 is about 382.7169566730.

The spelling of 56057421 in words is "fifty-six million, fifty-seven thousand, four hundred twenty-one".