211949867 has 2 divisors, whose sum is σ = 211949868. Its totient is φ = 211949866.

The previous prime is 211949849. The next prime is 211949873. The reversal of 211949867 is 768949112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211949867 - 2²⁰ = 210901291 is a prime.

It is a super-2 number, since 2×211949867² = 89845492242635378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211949167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105974933 + 105974934.

It is an arithmetic number, because the mean of its divisors is an integer number (105974934).

Almost surely, 2^211949867 is an apocalyptic number.

211949867 is a deficient number, since it is larger than the sum of its proper divisors (1).

211949867 is an equidigital number, since it uses as much as digits as its factorization.

211949867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 211949867 is about 14558.4981024830. The cubic root of 211949867 is about 596.2261905530.

The spelling of 211949867 in words is "two hundred eleven million, nine hundred forty-nine thousand, eight hundred sixty-seven".