56247421 has 4 divisors (see below), whose sum is σ = 56269792. Its totient is φ = 56225052.

The previous prime is 56247413. The next prime is 56247427. The reversal of 56247421 is 12474265.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56247421 - 2³ = 56247413 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 (56247427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6855 + ... + 12628.

It is an arithmetic number, because the mean of its divisors is an integer number (14067448).

Almost surely, 2^56247421 is an apocalyptic number.

It is an amenable number.

56247421 is a deficient number, since it is larger than the sum of its proper divisors (22371).

56247421 is a wasteful number, since it uses less digits than its factorization.

56247421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22370.

The product of its digits is 13440, while the sum is 31.

The square root of 56247421 is about 7499.8280646959. The cubic root of 56247421 is about 383.1488603679.

It can be divided in two parts, 5 and 6247421, that added together give a palindrome (6247426).

The spelling of 56247421 in words is "fifty-six million, two hundred forty-seven thousand, four hundred twenty-one".