163435021 has 2 divisors, whose sum is σ = 163435022. Its totient is φ = 163435020.

The previous prime is 163434977. The next prime is 163435037. The reversal of 163435021 is 120534361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93896100 + 69538921 = 9690^2 + 8339^2 .

It is a cyclic number.

It is not a de Polignac number, because 163435021 - 2¹⁹ = 162910733 is a prime.

It is a super-2 number, since 2×163435021² = 53422012178540882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163435081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81717510 + 81717511.

It is an arithmetic number, because the mean of its divisors is an integer number (81717511).

Almost surely, 2^163435021 is an apocalyptic number.

It is an amenable number.

163435021 is a deficient number, since it is larger than the sum of its proper divisors (1).

163435021 is an equidigital number, since it uses as much as digits as its factorization.

163435021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 163435021 is about 12784.1707200741. The cubic root of 163435021 is about 546.7410817711.

Adding to 163435021 its reverse (120534361), we get a palindrome (283969382).

The spelling of 163435021 in words is "one hundred sixty-three million, four hundred thirty-five thousand, twenty-one".