163432021 has 2 divisors, whose sum is σ = 163432022. Its totient is φ = 163432020.

The previous prime is 163432007. The next prime is 163432037. The reversal of 163432021 is 120234361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143280900 + 20151121 = 11970^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 163432021 - 2⁷ = 163431893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163431983 and 163432001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163432051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81716010 + 81716011.

It is an arithmetic number, because the mean of its divisors is an integer number (81716011).

Almost surely, 2^163432021 is an apocalyptic number.

It is an amenable number.

163432021 is a deficient number, since it is larger than the sum of its proper divisors (1).

163432021 is an equidigital number, since it uses as much as digits as its factorization.

163432021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 163432021 is about 12784.0533869348. The cubic root of 163432021 is about 546.7377364390.

Adding to 163432021 its reverse (120234361), we get a palindrome (283666382).

The spelling of 163432021 in words is "one hundred sixty-three million, four hundred thirty-two thousand, twenty-one".