211023221 has 2 divisors, whose sum is σ = 211023222. Its totient is φ = 211023220.

The previous prime is 211023181. The next prime is 211023233. The reversal of 211023221 is 122320112.

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., 125664100 + 85359121 = 11210^2 + 9239^2 .

It is a cyclic number.

It is not a de Polignac number, because 211023221 - 2¹⁰ = 211022197 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211023196 and 211023205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211023251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105511610 + 105511611.

It is an arithmetic number, because the mean of its divisors is an integer number (105511611).

Almost surely, 2^211023221 is an apocalyptic number.

It is an amenable number.

211023221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211023221 is an equidigital number, since it uses as much as digits as its factorization.

211023221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 211023221 is about 14526.6383241272. The cubic root of 211023221 is about 595.3560197782.

Adding to 211023221 its reverse (122320112), we get a palindrome (333343333).

The spelling of 211023221 in words is "two hundred eleven million, twenty-three thousand, two hundred twenty-one".