421336691 has 2 divisors, whose sum is σ = 421336692. Its totient is φ = 421336690.

The previous prime is 421336673. The next prime is 421336703. The reversal of 421336691 is 196633124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421336691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421336631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210668345 + 210668346.

It is an arithmetic number, because the mean of its divisors is an integer number (210668346).

Almost surely, 2^421336691 is an apocalyptic number.

421336691 is a deficient number, since it is larger than the sum of its proper divisors (1).

421336691 is an equidigital number, since it uses as much as digits as its factorization.

421336691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 421336691 is about 20526.4875465823. The cubic root of 421336691 is about 749.6808662982.

It can be divided in two parts, 4213 and 36691, that added together give a palindrome (40904).

The spelling of 421336691 in words is "four hundred twenty-one million, three hundred thirty-six thousand, six hundred ninety-one".