163421407 has 2 divisors, whose sum is σ = 163421408. Its totient is φ = 163421406.

The previous prime is 163421329. The next prime is 163421437. The reversal of 163421407 is 704124361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163421407 - 2²⁷ = 29203679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163421437) 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, 81710703 + 81710704.

It is an arithmetic number, because the mean of its divisors is an integer number (81710704).

Almost surely, 2^163421407 is an apocalyptic number.

163421407 is a deficient number, since it is larger than the sum of its proper divisors (1).

163421407 is an equidigital number, since it uses as much as digits as its factorization.

163421407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 163421407 is about 12783.6382536428. The cubic root of 163421407 is about 546.7259003252.

Adding to 163421407 its reverse (704124361), we get a palindrome (867545768).

The spelling of 163421407 in words is "one hundred sixty-three million, four hundred twenty-one thousand, four hundred seven".