211123139 has 2 divisors, whose sum is σ = 211123140. Its totient is φ = 211123138.

The previous prime is 211123123. The next prime is 211123169. The reversal of 211123139 is 931321112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211123139 - 2⁴ = 211123123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211123169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561569 + 105561570.

It is an arithmetic number, because the mean of its divisors is an integer number (105561570).

Almost surely, 2^211123139 is an apocalyptic number.

211123139 is a deficient number, since it is larger than the sum of its proper divisors (1).

211123139 is an equidigital number, since it uses as much as digits as its factorization.

211123139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 211123139 is about 14530.0770472837. The cubic root of 211123139 is about 595.4499705705.

The spelling of 211123139 in words is "two hundred eleven million, one hundred twenty-three thousand, one hundred thirty-nine".