56421247369 has 2 divisors, whose sum is σ = 56421247370. Its totient is φ = 56421247368.

The previous prime is 56421247357. The next prime is 56421247373. The reversal of 56421247369 is 96374212465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33107622025 + 23313625344 = 181955^2 + 152688^2 .

It is a cyclic number.

It is not a de Polignac number, because 56421247369 - 2⁹ = 56421246857 is a prime.

It is a super-2 number, since 2×56421247369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56421247319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28210623684 + 28210623685.

It is an arithmetic number, because the mean of its divisors is an integer number (28210623685).

Almost surely, 2^56421247369 is an apocalyptic number.

It is an amenable number.

56421247369 is a deficient number, since it is larger than the sum of its proper divisors (1).

56421247369 is an equidigital number, since it uses as much as digits as its factorization.

56421247369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 49.

The spelling of 56421247369 in words is "fifty-six billion, four hundred twenty-one million, two hundred forty-seven thousand, three hundred sixty-nine".