211122138 has 16 divisors (see below), whose sum is σ = 422475840. Its totient is φ = 70335456.

The previous prime is 211122137. The next prime is 211122157. The reversal of 211122138 is 831221112.

It is not an unprimeable number, because it can be changed into a prime (211122137) 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 in 7 ways as a sum of consecutive naturals, for example, 3606 + ... + 20862.

It is an arithmetic number, because the mean of its divisors is an integer number (26404740).

Almost surely, 2^211122138 is an apocalyptic number.

211122138 is an abundant number, since it is smaller than the sum of its proper divisors (211353702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211122138 is a wasteful number, since it uses less digits than its factorization.

211122138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19301.

The product of its digits is 192, while the sum is 21.

The square root of 211122138 is about 14530.0426014517. The cubic root of 211122138 is about 595.4490294983.

The spelling of 211122138 in words is "two hundred eleven million, one hundred twenty-two thousand, one hundred thirty-eight".