56140021 has 4 divisors (see below), whose sum is σ = 64160032. Its totient is φ = 48120012.

The previous prime is 56140013. The next prime is 56140067. The reversal of 56140021 is 12004165.

56140021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12004165 = 5 ⋅2400833.

It is a cyclic number.

It is not a de Polignac number, because 56140021 - 2³ = 56140013 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 (56140081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4009995 + ... + 4010008.

It is an arithmetic number, because the mean of its divisors is an integer number (16040008).

Almost surely, 2^56140021 is an apocalyptic number.

It is an amenable number.

56140021 is a deficient number, since it is larger than the sum of its proper divisors (8020011).

56140021 is an equidigital number, since it uses as much as digits as its factorization.

56140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8020010.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 56140021 is about 7492.6644793424. The cubic root of 56140021 is about 382.9048408455.

Adding to 56140021 its reverse (12004165), we get a palindrome (68144186).

The spelling of 56140021 in words is "fifty-six million, one hundred forty thousand, twenty-one".