211813229 has 2 divisors, whose sum is σ = 211813230. Its totient is φ = 211813228.

The previous prime is 211813211. The next prime is 211813249. The reversal of 211813229 is 922318112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135722500 + 76090729 = 11650^2 + 8723^2 .

It is a cyclic number.

It is not a de Polignac number, because 211813229 - 2¹⁶ = 211747693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211813249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105906614 + 105906615.

It is an arithmetic number, because the mean of its divisors is an integer number (105906615).

Almost surely, 2^211813229 is an apocalyptic number.

It is an amenable number.

211813229 is a deficient number, since it is larger than the sum of its proper divisors (1).

211813229 is an equidigital number, since it uses as much as digits as its factorization.

211813229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 211813229 is about 14553.8046228469. The cubic root of 211813229 is about 596.0980397028.

The spelling of 211813229 in words is "two hundred eleven million, eight hundred thirteen thousand, two hundred twenty-nine".