168070921 has 8 divisors (see below), whose sum is σ = 176718600. Its totient is φ = 159613440.

The previous prime is 168070901. The next prime is 168070927. The reversal of 168070921 is 129070861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5625 + 168065296 = 75^2 + 12964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168070921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168070927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45736 + ... + 49273.

It is an arithmetic number, because the mean of its divisors is an integer number (22089825).

Almost surely, 2^168070921 is an apocalyptic number.

It is an amenable number.

168070921 is a deficient number, since it is larger than the sum of its proper divisors (8647679).

168070921 is an equidigital number, since it uses as much as digits as its factorization.

168070921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95099.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 168070921 is about 12964.2169451147. The cubic root of 168070921 is about 551.8624694566.

The spelling of 168070921 in words is "one hundred sixty-eight million, seventy thousand, nine hundred twenty-one".