56420321 has 2 divisors, whose sum is σ = 56420322. Its totient is φ = 56420320.

The previous prime is 56420293. The next prime is 56420327. The reversal of 56420321 is 12302465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55338721 + 1081600 = 7439^2 + 1040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56420321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56420327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28210160 + 28210161.

It is an arithmetic number, because the mean of its divisors is an integer number (28210161).

Almost surely, 2^56420321 is an apocalyptic number.

It is an amenable number.

56420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

56420321 is an equidigital number, since it uses as much as digits as its factorization.

56420321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 56420321 is about 7511.3461509905. The cubic root of 56420321 is about 383.5410482748.

Adding to 56420321 its reverse (12302465), we get a palindrome (68722786).

The spelling of 56420321 in words is "fifty-six million, four hundred twenty thousand, three hundred twenty-one".