16827721 has 2 divisors, whose sum is σ = 16827722. Its totient is φ = 16827720.

The previous prime is 16827691. The next prime is 16827763. The reversal of 16827721 is 12772861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 739600 = 4011^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 16827721 - 2⁵ = 16827689 is a prime.

It is not a weakly prime, because it can be changed into another prime (16827821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8413860 + 8413861.

It is an arithmetic number, because the mean of its divisors is an integer number (8413861).

Almost surely, 2^16827721 is an apocalyptic number.

It is an amenable number.

16827721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16827721 is an equidigital number, since it uses as much as digits as its factorization.

16827721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 34.

The square root of 16827721 is about 4102.1605283070. The cubic root of 16827721 is about 256.2566243776.

It can be divided in two parts, 168 and 27721, that added together give a square (27889 = 167²).

The spelling of 16827721 in words is "sixteen million, eight hundred twenty-seven thousand, seven hundred twenty-one".