16712621 has 2 divisors, whose sum is σ = 16712622. Its totient is φ = 16712620.

The previous prime is 16712603. The next prime is 16712623. The reversal of 16712621 is 12621761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16491721 + 220900 = 4061^2 + 470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16712621 is a prime.

Together with 16712623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16712623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8356310 + 8356311.

It is an arithmetic number, because the mean of its divisors is an integer number (8356311).

Almost surely, 2^16712621 is an apocalyptic number.

It is an amenable number.

16712621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16712621 is an equidigital number, since it uses as much as digits as its factorization.

16712621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 16712621 is about 4088.1072637591. The cubic root of 16712621 is about 255.6710302827.

The spelling of 16712621 in words is "sixteen million, seven hundred twelve thousand, six hundred twenty-one".