56200021 has 2 divisors, whose sum is σ = 56200022. Its totient is φ = 56200020.

The previous prime is 56200019. The next prime is 56200091. The reversal of 56200021 is 12000265.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45077796 + 11122225 = 6714^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 56200021 - 2¹ = 56200019 is a prime.

Together with 56200019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 56199968 and 56200004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56200091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28100010 + 28100011.

It is an arithmetic number, because the mean of its divisors is an integer number (28100011).

Almost surely, 2^56200021 is an apocalyptic number.

It is an amenable number.

56200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56200021 is an equidigital number, since it uses as much as digits as its factorization.

56200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 56200021 is about 7496.6673262190. The cubic root of 56200021 is about 383.0412029289.

Adding to 56200021 its reverse (12000265), we get a palindrome (68200286).

It can be divided in two parts, 5 and 6200021, that added together give a palindrome (6200026).

The spelling of 56200021 in words is "fifty-six million, two hundred thousand, twenty-one".