56122821 has 16 divisors (see below), whose sum is σ = 85393600. Its totient is φ = 36403344.

The previous prime is 56122817. The next prime is 56122823. The reversal of 56122821 is 12822165.

It is a happy number.

56122821 is a `hidden beast` number, since 5 + 612 + 28 + 21 = 666.

It is not a de Polignac number, because 56122821 - 2² = 56122817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56122823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27091 + ... + 29088.

It is an arithmetic number, because the mean of its divisors is an integer number (5337100).

Almost surely, 2^56122821 is an apocalyptic number.

It is an amenable number.

56122821 is a deficient number, since it is larger than the sum of its proper divisors (29270779).

56122821 is a wasteful number, since it uses less digits than its factorization.

56122821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56225 (or 56219 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 56122821 is about 7491.5166021307. The cubic root of 56122821 is about 382.8657324646.

Adding to 56122821 its reverse (12822165), we get a palindrome (68944986).

The spelling of 56122821 in words is "fifty-six million, one hundred twenty-two thousand, eight hundred twenty-one".