16270721 has 2 divisors, whose sum is σ = 16270722. Its totient is φ = 16270720.

The previous prime is 16270699. The next prime is 16270733. The reversal of 16270721 is 12707261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13987600 + 2283121 = 3740^2 + 1511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16270721 is a prime.

It is not a weakly prime, because it can be changed into another prime (16270621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8135360 + 8135361.

It is an arithmetic number, because the mean of its divisors is an integer number (8135361).

Almost surely, 2^16270721 is an apocalyptic number.

It is an amenable number.

16270721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16270721 is an equidigital number, since it uses as much as digits as its factorization.

16270721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 16270721 is about 4033.6981790907. The cubic root of 16270721 is about 253.3974651040.

Adding to 16270721 its reverse (12707261), we get a palindrome (28977982).

The spelling of 16270721 in words is "sixteen million, two hundred seventy thousand, seven hundred twenty-one".