16102721 has 2 divisors, whose sum is σ = 16102722. Its totient is φ = 16102720.

The previous prime is 16102687. The next prime is 16102753. The reversal of 16102721 is 12720161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 579121 = 3940^2 + 761^2 .

It is an emirp because it is prime and its reverse (12720161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16102721 - 2¹⁴ = 16086337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16102693 and 16102702.

It is not a weakly prime, because it can be changed into another prime (16104721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8051360 + 8051361.

It is an arithmetic number, because the mean of its divisors is an integer number (8051361).

Almost surely, 2^16102721 is an apocalyptic number.

It is an amenable number.

16102721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16102721 is an equidigital number, since it uses as much as digits as its factorization.

16102721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 16102721 is about 4012.8195822887. The cubic root of 16102721 is about 252.5223115271.

Adding to 16102721 its reverse (12720161), we get a palindrome (28822882).

The spelling of 16102721 in words is "sixteen million, one hundred two thousand, seven hundred twenty-one".