211211131 has 4 divisors (see below), whose sum is σ = 216362664. Its totient is φ = 206059600.

The previous prime is 211211123. The next prime is 211211149. The reversal of 211211131 is 131112112.

It is a happy number.

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 211211131 - 2³ = 211211123 is a prime.

It is a super-2 number, since 2×211211131² = 89220283716598322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211211171) 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 3 ways as a sum of consecutive naturals, for example, 2575705 + ... + 2575786.

It is an arithmetic number, because the mean of its divisors is an integer number (54090666).

Almost surely, 2^211211131 is an apocalyptic number.

211211131 is a deficient number, since it is larger than the sum of its proper divisors (5151533).

211211131 is an equidigital number, since it uses as much as digits as its factorization.

211211131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151532.

The product of its digits is 12, while the sum is 13.

The square root of 211211131 is about 14533.1046579869. The cubic root of 211211131 is about 595.5326830524.

Adding to 211211131 its reverse (131112112), we get a palindrome (342323243).

The spelling of 211211131 in words is "two hundred eleven million, two hundred eleven thousand, one hundred thirty-one".