16968821 has 2 divisors, whose sum is σ = 16968822. Its totient is φ = 16968820.

The previous prime is 16968817. The next prime is 16968827. The reversal of 16968821 is 12886961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11628100 + 5340721 = 3410^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 16968821 - 2² = 16968817 is a prime.

It is a super-2 number, since 2×16968821² = 575881772260082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16968827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8484410 + 8484411.

It is an arithmetic number, because the mean of its divisors is an integer number (8484411).

Almost surely, 2^16968821 is an apocalyptic number.

It is an amenable number.

16968821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16968821 is an equidigital number, since it uses as much as digits as its factorization.

16968821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 16968821 is about 4119.3228812512. The cubic root of 16968821 is about 256.9708668092.

The spelling of 16968821 in words is "sixteen million, nine hundred sixty-eight thousand, eight hundred twenty-one".