211422917 has 2 divisors, whose sum is σ = 211422918. Its totient is φ = 211422916.

The previous prime is 211422907. The next prime is 211422919. The reversal of 211422917 is 719224112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211237156 + 185761 = 14534^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 211422917 - 2¹⁰ = 211421893 is a prime.

Together with 211422919, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211422917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211422919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105711458 + 105711459.

It is an arithmetic number, because the mean of its divisors is an integer number (105711459).

Almost surely, 2^211422917 is an apocalyptic number.

It is an amenable number.

211422917 is a deficient number, since it is larger than the sum of its proper divisors (1).

211422917 is an equidigital number, since it uses as much as digits as its factorization.

211422917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 211422917 is about 14540.3891626050. The cubic root of 211422917 is about 595.7316677546.

The spelling of 211422917 in words is "two hundred eleven million, four hundred twenty-two thousand, nine hundred seventeen".