211242979 has 2 divisors, whose sum is σ = 211242980. Its totient is φ = 211242978.

The previous prime is 211242973. The next prime is 211243031. The reversal of 211242979 is 979242112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211242979 is a prime.

It is not a weakly prime, because it can be changed into another prime (211242973) 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, 105621489 + 105621490.

It is an arithmetic number, because the mean of its divisors is an integer number (105621490).

Almost surely, 2^211242979 is an apocalyptic number.

211242979 is a deficient number, since it is larger than the sum of its proper divisors (1).

211242979 is an equidigital number, since it uses as much as digits as its factorization.

211242979 is an odious number, because the sum of its binary digits is odd.

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

The square root of 211242979 is about 14534.2003219991. The cubic root of 211242979 is about 595.5626145110.

The spelling of 211242979 in words is "two hundred eleven million, two hundred forty-two thousand, nine hundred seventy-nine".