56357821 has 16 divisors (see below), whose sum is σ = 63645120. Its totient is φ = 49553280.

The previous prime is 56357813. The next prime is 56357849. The reversal of 56357821 is 12875365.

It is a cyclic number.

It is not a de Polignac number, because 56357821 - 2³ = 56357813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56357801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21690 + ... + 24148.

It is an arithmetic number, because the mean of its divisors is an integer number (3977820).

Almost surely, 2^56357821 is an apocalyptic number.

It is an amenable number.

56357821 is a deficient number, since it is larger than the sum of its proper divisors (7287299).

56357821 is a wasteful number, since it uses less digits than its factorization.

56357821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556.

The product of its digits is 50400, while the sum is 37.

The square root of 56357821 is about 7507.1846254105. The cubic root of 56357821 is about 383.3993725333.

It can be divided in two parts, 5635 and 7821, that added together give a square (13456 = 116²).

The spelling of 56357821 in words is "fifty-six million, three hundred fifty-seven thousand, eight hundred twenty-one".