221001102209 has 2 divisors, whose sum is σ = 221001102210. Its totient is φ = 221001102208.

The previous prime is 221001102199. The next prime is 221001102211. The reversal of 221001102209 is 902201100122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116253721600 + 104747380609 = 340960^2 + 323647^2 .

It is a cyclic number.

It is not a de Polignac number, because 221001102209 - 2³⁶ = 152281625473 is a prime.

Together with 221001102211, 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 (221001102709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500551104 + 110500551105.

It is an arithmetic number, because the mean of its divisors is an integer number (110500551105).

Almost surely, 2^221001102209 is an apocalyptic number.

It is an amenable number.

221001102209 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001102209 is an equidigital number, since it uses as much as digits as its factorization.

221001102209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 221001102209 in words is "two hundred twenty-one billion, one million, one hundred two thousand, two hundred nine".