56424421 has 4 divisors (see below), whose sum is σ = 56546752. Its totient is φ = 56302092.

The previous prime is 56424391. The next prime is 56424427. The reversal of 56424421 is 12442465.

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 56424421 - 2⁷ = 56424293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56424421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56424427) 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, 60471 + ... + 61396.

It is an arithmetic number, because the mean of its divisors is an integer number (14136688).

Almost surely, 2^56424421 is an apocalyptic number.

It is an amenable number.

56424421 is a deficient number, since it is larger than the sum of its proper divisors (122331).

56424421 is a wasteful number, since it uses less digits than its factorization.

56424421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122330.

The product of its digits is 7680, while the sum is 28.

The square root of 56424421 is about 7511.6190664863. The cubic root of 56424421 is about 383.5503385457.

Adding to 56424421 its reverse (12442465), we get a palindrome (68866886).

The spelling of 56424421 in words is "fifty-six million, four hundred twenty-four thousand, four hundred twenty-one".