211163221 has 2 divisors, whose sum is σ = 211163222. Its totient is φ = 211163220.

The previous prime is 211163219. The next prime is 211163237. The reversal of 211163221 is 122361112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209931121 + 1232100 = 14489^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 211163221 - 2¹ = 211163219 is a prime.

Together with 211163219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211163201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105581610 + 105581611.

It is an arithmetic number, because the mean of its divisors is an integer number (105581611).

Almost surely, 2^211163221 is an apocalyptic number.

It is an amenable number.

211163221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211163221 is an equidigital number, since it uses as much as digits as its factorization.

211163221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 211163221 is about 14531.4562587512. The cubic root of 211163221 is about 595.4876505008.

The spelling of 211163221 in words is "two hundred eleven million, one hundred sixty-three thousand, two hundred twenty-one".