211394939 has 4 divisors (see below), whose sum is σ = 241594224. Its totient is φ = 181195656.

The previous prime is 211394873. The next prime is 211394971. The reversal of 211394939 is 939493112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211394939 - 2⁸ = 211394683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211394896 and 211394905.

It is not an unprimeable number, because it can be changed into a prime (211394039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15099632 + ... + 15099645.

It is an arithmetic number, because the mean of its divisors is an integer number (60398556).

Almost surely, 2^211394939 is an apocalyptic number.

211394939 is a deficient number, since it is larger than the sum of its proper divisors (30199285).

211394939 is an equidigital number, since it uses as much as digits as its factorization.

211394939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30199284.

The product of its digits is 52488, while the sum is 41.

The square root of 211394939 is about 14539.4270519852. The cubic root of 211394939 is about 595.7053884908.

The spelling of 211394939 in words is "two hundred eleven million, three hundred ninety-four thousand, nine hundred thirty-nine".