16221197 has 2 divisors, whose sum is σ = 16221198. Its totient is φ = 16221196.

The previous prime is 16221151. The next prime is 16221203. The reversal of 16221197 is 79112261.

16221197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14092516 + 2128681 = 3754^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 16221197 - 2¹⁴ = 16204813 is a prime.

It is a super-2 number, since 2×16221197² = 526254464225618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16221137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8110598 + 8110599.

It is an arithmetic number, because the mean of its divisors is an integer number (8110599).

Almost surely, 2^16221197 is an apocalyptic number.

It is an amenable number.

16221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221197 is an equidigital number, since it uses as much as digits as its factorization.

16221197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 16221197 is about 4027.5547171950. The cubic root of 16221197 is about 253.1401110117.

The spelling of 16221197 in words is "sixteen million, two hundred twenty-one thousand, one hundred ninety-seven".