16016621 has 2 divisors, whose sum is σ = 16016622. Its totient is φ = 16016620.

The previous prime is 16016591. The next prime is 16016629. The reversal of 16016621 is 12661061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15319396 + 697225 = 3914^2 + 835^2 .

It is a cyclic number.

It is not a de Polignac number, because 16016621 - 2⁶ = 16016557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16016629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8008310 + 8008311.

It is an arithmetic number, because the mean of its divisors is an integer number (8008311).

Almost surely, 2^16016621 is an apocalyptic number.

It is an amenable number.

16016621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16016621 is an equidigital number, since it uses as much as digits as its factorization.

16016621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16016621 is about 4002.0770857144. The cubic root of 16016621 is about 252.0714345650.

Adding to 16016621 its reverse (12661061), we get a palindrome (28677682).

The spelling of 16016621 in words is "sixteen million, sixteen thousand, six hundred twenty-one".