56421331 has 2 divisors, whose sum is σ = 56421332. Its totient is φ = 56421330.

The previous prime is 56421319. The next prime is 56421341. The reversal of 56421331 is 13312465.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56421331 - 2¹¹ = 56419283 is a prime.

It is a super-2 number, since 2×56421331² = 6366733183623122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56421296 and 56421305.

It is not a weakly prime, because it can be changed into another prime (56421341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28210665 + 28210666.

It is an arithmetic number, because the mean of its divisors is an integer number (28210666).

Almost surely, 2^56421331 is an apocalyptic number.

56421331 is a deficient number, since it is larger than the sum of its proper divisors (1).

56421331 is an equidigital number, since it uses as much as digits as its factorization.

56421331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 56421331 is about 7511.4133823136. The cubic root of 56421331 is about 383.5433368955.

Adding to 56421331 its reverse (13312465), we get a palindrome (69733796).

The spelling of 56421331 in words is "fifty-six million, four hundred twenty-one thousand, three hundred thirty-one".