201221099 has 2 divisors, whose sum is σ = 201221100. Its totient is φ = 201221098.

The previous prime is 201221017. The next prime is 201221101. The reversal of 201221099 is 990122102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221099 - 2⁸ = 201220843 is a prime.

Together with 201221101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201224099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610549 + 100610550.

It is an arithmetic number, because the mean of its divisors is an integer number (100610550).

Almost surely, 2^201221099 is an apocalyptic number.

201221099 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221099 is an equidigital number, since it uses as much as digits as its factorization.

201221099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 201221099 is about 14185.2422961330. The cubic root of 201221099 is about 585.9913053415.

The spelling of 201221099 in words is "two hundred one million, two hundred twenty-one thousand, ninety-nine".