16737421 has 2 divisors, whose sum is σ = 16737422. Its totient is φ = 16737420.

The previous prime is 16737377. The next prime is 16737439. The reversal of 16737421 is 12473761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 42025 = 4086^2 + 205^2 .

It is an emirp because it is prime and its reverse (12473761) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16737421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16737481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8368710 + 8368711.

It is an arithmetic number, because the mean of its divisors is an integer number (8368711).

Almost surely, 2^16737421 is an apocalyptic number.

It is an amenable number.

16737421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16737421 is an equidigital number, since it uses as much as digits as its factorization.

16737421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 16737421 is about 4091.1393278645. The cubic root of 16737421 is about 255.7974319170.

The spelling of 16737421 in words is "sixteen million, seven hundred thirty-seven thousand, four hundred twenty-one".