16921867 has 2 divisors, whose sum is σ = 16921868. Its totient is φ = 16921866.

The previous prime is 16921847. The next prime is 16921901. The reversal of 16921867 is 76812961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16921867 - 2¹⁵ = 16889099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16921847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8460933 + 8460934.

It is an arithmetic number, because the mean of its divisors is an integer number (8460934).

Almost surely, 2^16921867 is an apocalyptic number.

16921867 is a deficient number, since it is larger than the sum of its proper divisors (1).

16921867 is an equidigital number, since it uses as much as digits as its factorization.

16921867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 16921867 is about 4113.6196955966. The cubic root of 16921867 is about 256.7336286373.

The spelling of 16921867 in words is "sixteen million, nine hundred twenty-one thousand, eight hundred sixty-seven".