163252421 has 2 divisors, whose sum is σ = 163252422. Its totient is φ = 163252420.

The previous prime is 163252403. The next prime is 163252423. The reversal of 163252421 is 124252361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146071396 + 17181025 = 12086^2 + 4145^2 .

It is an emirp because it is prime and its reverse (124252361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163252421 - 2⁶ = 163252357 is a prime.

It is a super-2 number, since 2×163252421² = 53302705924722482, which contains 22 as substring.

Together with 163252423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163252423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81626210 + 81626211.

It is an arithmetic number, because the mean of its divisors is an integer number (81626211).

Almost surely, 2^163252421 is an apocalyptic number.

It is an amenable number.

163252421 is a deficient number, since it is larger than the sum of its proper divisors (1).

163252421 is an equidigital number, since it uses as much as digits as its factorization.

163252421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 26.

The square root of 163252421 is about 12777.0270798805. The cubic root of 163252421 is about 546.5373879225.

The spelling of 163252421 in words is "one hundred sixty-three million, two hundred fifty-two thousand, four hundred twenty-one".