16056221 has 2 divisors, whose sum is σ = 16056222. Its totient is φ = 16056220.

The previous prime is 16056203. The next prime is 16056239. The reversal of 16056221 is 12265061.

It is a balanced prime because it is at equal distance from previous prime (16056203) and next prime (16056239).

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 3024121 = 3610^2 + 1739^2 .

It is an emirp because it is prime and its reverse (12265061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16056221 - 2²² = 11861917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16056421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8028110 + 8028111.

It is an arithmetic number, because the mean of its divisors is an integer number (8028111).

Almost surely, 2^16056221 is an apocalyptic number.

It is an amenable number.

16056221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16056221 is an equidigital number, since it uses as much as digits as its factorization.

16056221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 16056221 is about 4007.0214623833. The cubic root of 16056221 is about 252.2790067169.

The spelling of 16056221 in words is "sixteen million, fifty-six thousand, two hundred twenty-one".