221412197 has 2 divisors, whose sum is σ = 221412198. Its totient is φ = 221412196.

The previous prime is 221412161. The next prime is 221412223. The reversal of 221412197 is 791214122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221384641 + 27556 = 14879^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 221412197 - 2⁶ = 221412133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221492197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110706098 + 110706099.

It is an arithmetic number, because the mean of its divisors is an integer number (110706099).

Almost surely, 2^221412197 is an apocalyptic number.

It is an amenable number.

221412197 is a deficient number, since it is larger than the sum of its proper divisors (1).

221412197 is an equidigital number, since it uses as much as digits as its factorization.

221412197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 221412197 is about 14879.9259742782. The cubic root of 221412197 is about 604.9700114908.

The spelling of 221412197 in words is "two hundred twenty-one million, four hundred twelve thousand, one hundred ninety-seven".