16738921 has 2 divisors, whose sum is σ = 16738922. Its totient is φ = 16738920.

The previous prime is 16738919. The next prime is 16738951. The reversal of 16738921 is 12983761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16040025 + 698896 = 4005^2 + 836^2 .

It is a cyclic number.

It is not a de Polignac number, because 16738921 - 2¹ = 16738919 is a prime.

Together with 16738919, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16738901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8369460 + 8369461.

It is an arithmetic number, because the mean of its divisors is an integer number (8369461).

Almost surely, 2^16738921 is an apocalyptic number.

It is an amenable number.

16738921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16738921 is an equidigital number, since it uses as much as digits as its factorization.

16738921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 16738921 is about 4091.3226467733. The cubic root of 16738921 is about 255.8050731716.

The spelling of 16738921 in words is "sixteen million, seven hundred thirty-eight thousand, nine hundred twenty-one".