211971229 has 2 divisors, whose sum is σ = 211971230. Its totient is φ = 211971228.

The previous prime is 211971217. The next prime is 211971259. The reversal of 211971229 is 922179112.

It is a happy number.

211971229 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., 193265604 + 18705625 = 13902^2 + 4325^2 .

It is a cyclic number.

It is not a de Polignac number, because 211971229 - 2¹¹ = 211969181 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211971194 and 211971203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211971259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105985614 + 105985615.

It is an arithmetic number, because the mean of its divisors is an integer number (105985615).

Almost surely, 2^211971229 is an apocalyptic number.

It is an amenable number.

211971229 is a deficient number, since it is larger than the sum of its proper divisors (1).

211971229 is an equidigital number, since it uses as much as digits as its factorization.

211971229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 34.

The square root of 211971229 is about 14559.2317448415. The cubic root of 211971229 is about 596.2462206922.

The spelling of 211971229 in words is "two hundred eleven million, nine hundred seventy-one thousand, two hundred twenty-nine".