16936421 has 2 divisors, whose sum is σ = 16936422. Its totient is φ = 16936420.

The previous prime is 16936397. The next prime is 16936427. The reversal of 16936421 is 12463961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16900321 + 36100 = 4111^2 + 190^2 .

It is an emirp because it is prime and its reverse (12463961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16936421 - 2⁶ = 16936357 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16936427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8468210 + 8468211.

It is an arithmetic number, because the mean of its divisors is an integer number (8468211).

Almost surely, 2^16936421 is an apocalyptic number.

It is an amenable number.

16936421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16936421 is an equidigital number, since it uses as much as digits as its factorization.

16936421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 16936421 is about 4115.3883170364. The cubic root of 16936421 is about 256.8072105599.

The spelling of 16936421 in words is "sixteen million, nine hundred thirty-six thousand, four hundred twenty-one".