211979123 has 2 divisors, whose sum is σ = 211979124. Its totient is φ = 211979122.

The previous prime is 211979113. The next prime is 211979189. The reversal of 211979123 is 321979112.

211979123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211979123 - 2⁴ = 211979107 is a prime.

It is not a weakly prime, because it can be changed into another prime (211979113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105989561 + 105989562.

It is an arithmetic number, because the mean of its divisors is an integer number (105989562).

Almost surely, 2^211979123 is an apocalyptic number.

211979123 is a deficient number, since it is larger than the sum of its proper divisors (1).

211979123 is an equidigital number, since it uses as much as digits as its factorization.

211979123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 211979123 is about 14559.5028417869. The cubic root of 211979123 is about 596.2536221829.

The spelling of 211979123 in words is "two hundred eleven million, nine hundred seventy-nine thousand, one hundred twenty-three".