56011421 has 2 divisors, whose sum is σ = 56011422. Its totient is φ = 56011420.

The previous prime is 56011387. The next prime is 56011429. The reversal of 56011421 is 12411065.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42432196 + 13579225 = 6514^2 + 3685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56011421 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 56011393 and 56011402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56011429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28005710 + 28005711.

It is an arithmetic number, because the mean of its divisors is an integer number (28005711).

Almost surely, 2^56011421 is an apocalyptic number.

It is an amenable number.

56011421 is a deficient number, since it is larger than the sum of its proper divisors (1).

56011421 is an equidigital number, since it uses as much as digits as its factorization.

56011421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 56011421 is about 7484.0778323051. The cubic root of 56011421 is about 382.6122438187.

Adding to 56011421 its reverse (12411065), we get a palindrome (68422486).

The spelling of 56011421 in words is "fifty-six million, eleven thousand, four hundred twenty-one".