421312387 has 2 divisors, whose sum is σ = 421312388. Its totient is φ = 421312386.

The previous prime is 421312379. The next prime is 421312417. The reversal of 421312387 is 783213124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421312387 - 2³ = 421312379 is a prime.

It is a Chen prime.

It is equal to p_22410598 and since 421312387 and 22410598 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (421312987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210656193 + 210656194.

It is an arithmetic number, because the mean of its divisors is an integer number (210656194).

Almost surely, 2^421312387 is an apocalyptic number.

421312387 is a deficient number, since it is larger than the sum of its proper divisors (1).

421312387 is an equidigital number, since it uses as much as digits as its factorization.

421312387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 421312387 is about 20525.8955224857. The cubic root of 421312387 is about 749.6664513861. Note that the first 3 decimals are identical.

The spelling of 421312387 in words is "four hundred twenty-one million, three hundred twelve thousand, three hundred eighty-seven".