211212091 has 2 divisors, whose sum is σ = 211212092. Its totient is φ = 211212090.

The previous prime is 211212019. The next prime is 211212101. The reversal of 211212091 is 190212112.

It is a happy number.

Together with previous prime (211212019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211212091 - 2¹⁷ = 211081019 is a prime.

It is a super-2 number, since 2×211212091² = 89221094769184562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211212011) 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, 105606045 + 105606046.

It is an arithmetic number, because the mean of its divisors is an integer number (105606046).

Almost surely, 2^211212091 is an apocalyptic number.

211212091 is a deficient number, since it is larger than the sum of its proper divisors (1).

211212091 is an equidigital number, since it uses as much as digits as its factorization.

211212091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 211212091 is about 14533.1376859920. The cubic root of 211212091 is about 595.5335853257.

The spelling of 211212091 in words is "two hundred eleven million, two hundred twelve thousand, ninety-one".