56006021 has 2 divisors, whose sum is σ = 56006022. Its totient is φ = 56006020.

The previous prime is 56006017. The next prime is 56006033. The reversal of 56006021 is 12060065.

56006021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41860900 + 14145121 = 6470^2 + 3761^2 .

It is a cyclic number.

It is not a de Polignac number, because 56006021 - 2² = 56006017 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 56005984 and 56006002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56006521) 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 as a sum of consecutive naturals, namely, 28003010 + 28003011.

It is an arithmetic number, because the mean of its divisors is an integer number (28003011).

Almost surely, 2^56006021 is an apocalyptic number.

It is an amenable number.

56006021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56006021 is an equidigital number, since it uses as much as digits as its factorization.

56006021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 56006021 is about 7483.7170577194. The cubic root of 56006021 is about 382.5999476805.

Adding to 56006021 its reverse (12060065), we get a palindrome (68066086).

The spelling of 56006021 in words is "fifty-six million, six thousand, twenty-one".