402421442491 has 2 divisors, whose sum is σ = 402421442492. Its totient is φ = 402421442490.

The previous prime is 402421442393. The next prime is 402421442513. The reversal of 402421442491 is 194244124204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402421442491 - 2⁹ = 402421441979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402421442491.

It is not a weakly prime, because it can be changed into another prime (402421452491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201210721245 + 201210721246.

It is an arithmetic number, because the mean of its divisors is an integer number (201210721246).

Almost surely, 2^402421442491 is an apocalyptic number.

402421442491 is a deficient number, since it is larger than the sum of its proper divisors (1).

402421442491 is an equidigital number, since it uses as much as digits as its factorization.

402421442491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 37.

Adding to 402421442491 its reverse (194244124204), we get a palindrome (596665566695).

The spelling of 402421442491 in words is "four hundred two billion, four hundred twenty-one million, four hundred forty-two thousand, four hundred ninety-one".