211663121 has 2 divisors, whose sum is σ = 211663122. Its totient is φ = 211663120.

The previous prime is 211663103. The next prime is 211663159. The reversal of 211663121 is 121366112.

211663121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177848896 + 33814225 = 13336^2 + 5815^2 .

It is a cyclic number.

It is not a de Polignac number, because 211663121 - 2¹⁴ = 211646737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211663171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105831560 + 105831561.

It is an arithmetic number, because the mean of its divisors is an integer number (105831561).

Almost surely, 2^211663121 is an apocalyptic number.

It is an amenable number.

211663121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211663121 is an equidigital number, since it uses as much as digits as its factorization.

211663121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 211663121 is about 14548.6467068247. The cubic root of 211663121 is about 595.9571919841.

The spelling of 211663121 in words is "two hundred eleven million, six hundred sixty-three thousand, one hundred twenty-one".