56416421 has 4 divisors (see below), whose sum is σ = 59735052. Its totient is φ = 53097792.

The previous prime is 56416417. The next prime is 56416429. The reversal of 56416421 is 12461465.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31024900 + 25391521 = 5570^2 + 5039^2 .

It is a cyclic number.

It is not a de Polignac number, because 56416421 - 2² = 56416417 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 (56416429) 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, 1659290 + ... + 1659323.

It is an arithmetic number, because the mean of its divisors is an integer number (14933763).

Almost surely, 2^56416421 is an apocalyptic number.

It is an amenable number.

56416421 is a deficient number, since it is larger than the sum of its proper divisors (3318631).

56416421 is a wasteful number, since it uses less digits than its factorization.

56416421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318630.

The product of its digits is 5760, while the sum is 29.

The square root of 56416421 is about 7511.0865392432. The cubic root of 56416421 is about 383.5322107701.

Adding to 56416421 its reverse (12461465), we get a palindrome (68877886).

The spelling of 56416421 in words is "fifty-six million, four hundred sixteen thousand, four hundred twenty-one".