211223131 has 8 divisors (see below), whose sum is σ = 244306944. Its totient is φ = 178866600.

The previous prime is 211223087. The next prime is 211223137. The reversal of 211223131 is 131322112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211223131 - 2¹⁵ = 211190363 is a prime.

It is a super-2 number, since 2×211223131² = 89230422138886322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211223137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181195 + ... + 182356.

It is an arithmetic number, because the mean of its divisors is an integer number (30538368).

Almost surely, 2^211223131 is an apocalyptic number.

211223131 is a deficient number, since it is larger than the sum of its proper divisors (33083813).

211223131 is an equidigital number, since it uses as much as digits as its factorization.

211223131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363641.

The product of its digits is 72, while the sum is 16.

The square root of 211223131 is about 14533.5175026557. The cubic root of 211223131 is about 595.5439612725.

Adding to 211223131 its reverse (131322112), we get a palindrome (342545243).

The spelling of 211223131 in words is "two hundred eleven million, two hundred twenty-three thousand, one hundred thirty-one".