168350012921 has 2 divisors, whose sum is σ = 168350012922. Its totient is φ = 168350012920.

The previous prime is 168350012741. The next prime is 168350012977. The reversal of 168350012921 is 129210053861.

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., 93363858025 + 74986154896 = 305555^2 + 273836^2 .

It is a cyclic number.

It is not a de Polignac number, because 168350012921 - 2³⁴ = 151170143737 is a prime.

It is not a weakly prime, because it can be changed into another prime (168350812921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84175006460 + 84175006461.

It is an arithmetic number, because the mean of its divisors is an integer number (84175006461).

Almost surely, 2^168350012921 is an apocalyptic number.

It is an amenable number.

168350012921 is a deficient number, since it is larger than the sum of its proper divisors (1).

168350012921 is an equidigital number, since it uses as much as digits as its factorization.

168350012921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 168350012921 in words is "one hundred sixty-eight billion, three hundred fifty million, twelve thousand, nine hundred twenty-one".