213661211 has 2 divisors, whose sum is σ = 213661212. Its totient is φ = 213661210.

The previous prime is 213661181. The next prime is 213661247. The reversal of 213661211 is 112166312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213661211 is a prime.

It is a super-2 number, since 2×213661211² = 91302226171973042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213661271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106830605 + 106830606.

It is an arithmetic number, because the mean of its divisors is an integer number (106830606).

Almost surely, 2^213661211 is an apocalyptic number.

213661211 is a deficient number, since it is larger than the sum of its proper divisors (1).

213661211 is an equidigital number, since it uses as much as digits as its factorization.

213661211 is an odious number, because the sum of its binary digits is odd.

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

The square root of 213661211 is about 14617.1546820850. The cubic root of 213661211 is about 597.8265912933.

The spelling of 213661211 in words is "two hundred thirteen million, six hundred sixty-one thousand, two hundred eleven".