211423133 has 4 divisors (see below), whose sum is σ = 214889148. Its totient is φ = 207957120.

The previous prime is 211423109. The next prime is 211423141. The reversal of 211423133 is 331324112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 73994404 + 137428729 = 8602^2 + 11723^2 .

It is a cyclic number.

It is not a de Polignac number, because 211423133 - 2¹⁰ = 211422109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211423633) 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, 1732916 + ... + 1733037.

It is an arithmetic number, because the mean of its divisors is an integer number (53722287).

Almost surely, 2^211423133 is an apocalyptic number.

It is an amenable number.

211423133 is a deficient number, since it is larger than the sum of its proper divisors (3466015).

211423133 is an equidigital number, since it uses as much as digits as its factorization.

211423133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3466014.

The product of its digits is 432, while the sum is 20.

The square root of 211423133 is about 14540.3965901897. The cubic root of 211423133 is about 595.7318706308.

Adding to 211423133 its reverse (331324112), we get a palindrome (542747245).

The spelling of 211423133 in words is "two hundred eleven million, four hundred twenty-three thousand, one hundred thirty-three".