221196901 has 2 divisors, whose sum is σ = 221196902. Its totient is φ = 221196900.

The previous prime is 221196893. The next prime is 221196947. The reversal of 221196901 is 109691122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165096801 + 56100100 = 12849^2 + 7490^2 .

It is a cyclic number.

It is not a de Polignac number, because 221196901 - 2³ = 221196893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221196961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110598450 + 110598451.

It is an arithmetic number, because the mean of its divisors is an integer number (110598451).

Almost surely, 2^221196901 is an apocalyptic number.

It is an amenable number.

221196901 is a deficient number, since it is larger than the sum of its proper divisors (1).

221196901 is an equidigital number, since it uses as much as digits as its factorization.

221196901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 221196901 is about 14872.6897701794. The cubic root of 221196901 is about 604.7738617081.

The spelling of 221196901 in words is "two hundred twenty-one million, one hundred ninety-six thousand, nine hundred one".