402421511 has 2 divisors, whose sum is σ = 402421512. Its totient is φ = 402421510.

The previous prime is 402421507. The next prime is 402421517. The reversal of 402421511 is 115124204.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402421511 - 2² = 402421507 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402421517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201210755 + 201210756.

It is an arithmetic number, because the mean of its divisors is an integer number (201210756).

Almost surely, 2^402421511 is an apocalyptic number.

402421511 is a deficient number, since it is larger than the sum of its proper divisors (1).

402421511 is an equidigital number, since it uses as much as digits as its factorization.

402421511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 402421511 is about 20060.4464307253. The cubic root of 402421511 is about 738.2901299511.

Adding to 402421511 its reverse (115124204), we get a palindrome (517545715).

The spelling of 402421511 in words is "four hundred two million, four hundred twenty-one thousand, five hundred eleven".