211422979 has 2 divisors, whose sum is σ = 211422980. Its totient is φ = 211422978.

The previous prime is 211422977. The next prime is 211423063. The reversal of 211422979 is 979224112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211422979 - 2¹ = 211422977 is a prime.

Together with 211422977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211422977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105711489 + 105711490.

It is an arithmetic number, because the mean of its divisors is an integer number (105711490).

Almost surely, 2^211422979 is an apocalyptic number.

211422979 is a deficient number, since it is larger than the sum of its proper divisors (1).

211422979 is an equidigital number, since it uses as much as digits as its factorization.

211422979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 211422979 is about 14540.3912945973. The cubic root of 211422979 is about 595.7317259876.

The spelling of 211422979 in words is "two hundred eleven million, four hundred twenty-two thousand, nine hundred seventy-nine".