221199101 has 2 divisors, whose sum is σ = 221199102. Its totient is φ = 221199100.

The previous prime is 221199001. The next prime is 221199127. The reversal of 221199101 is 101991122.

It is an a-pointer prime, because the next prime (221199127) can be obtained adding 221199101 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209815225 + 11383876 = 14485^2 + 3374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221199101 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 (221199161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110599550 + 110599551.

It is an arithmetic number, because the mean of its divisors is an integer number (110599551).

Almost surely, 2^221199101 is an apocalyptic number.

It is an amenable number.

221199101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221199101 is an equidigital number, since it uses as much as digits as its factorization.

221199101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 221199101 is about 14872.7637310622. The cubic root of 221199101 is about 604.7758667062.

The spelling of 221199101 in words is "two hundred twenty-one million, one hundred ninety-nine thousand, one hundred one".