56610021 has 8 divisors (see below), whose sum is σ = 81286240. Its totient is φ = 34836912.

The previous prime is 56610019. The next prime is 56610031. The reversal of 56610021 is 12001665.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56610021 - 2¹ = 56610019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 56610021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56610031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725731 + ... + 725808.

It is an arithmetic number, because the mean of its divisors is an integer number (10160780).

Almost surely, 2^56610021 is an apocalyptic number.

It is an amenable number.

56610021 is a deficient number, since it is larger than the sum of its proper divisors (24676219).

56610021 is a wasteful number, since it uses less digits than its factorization.

56610021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451555.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 56610021 is about 7523.9631179319. The cubic root of 56610021 is about 383.9704227979.

Adding to 56610021 its reverse (12001665), we get a palindrome (68611686).

The spelling of 56610021 in words is "fifty-six million, six hundred ten thousand, twenty-one".