168853021 has 2 divisors, whose sum is σ = 168853022. Its totient is φ = 168853020.

The previous prime is 168853007. The next prime is 168853033. The reversal of 168853021 is 120358861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125753796 + 43099225 = 11214^2 + 6565^2 .

It is a cyclic number.

It is not a de Polignac number, because 168853021 - 2²³ = 160464413 is a prime.

It is a super-2 number, since 2×168853021² = 57022685401652882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168853121) 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, 84426510 + 84426511.

It is an arithmetic number, because the mean of its divisors is an integer number (84426511).

Almost surely, 2^168853021 is an apocalyptic number.

It is an amenable number.

168853021 is a deficient number, since it is larger than the sum of its proper divisors (1).

168853021 is an equidigital number, since it uses as much as digits as its factorization.

168853021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 168853021 is about 12994.3457318943. The cubic root of 168853021 is about 552.7171560260.

The spelling of 168853021 in words is "one hundred sixty-eight million, eight hundred fifty-three thousand, twenty-one".