211242133 has 4 divisors (see below), whose sum is σ = 222360160. Its totient is φ = 200124108.

The previous prime is 211242131. The next prime is 211242137. The reversal of 211242133 is 331242112.

It is a happy number.

211242133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211242133 - 2¹ = 211242131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 11118007 = 211242133 / (2 + 1 + 1 + 2 + 4 + 2 + 1 + 3 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211242133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211242131) 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, 5558985 + ... + 5559022.

It is an arithmetic number, because the mean of its divisors is an integer number (55590040).

Almost surely, 2^211242133 is an apocalyptic number.

It is an amenable number.

211242133 is a deficient number, since it is larger than the sum of its proper divisors (11118027).

211242133 is a wasteful number, since it uses less digits than its factorization.

211242133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11118026.

The product of its digits is 288, while the sum is 19.

The square root of 211242133 is about 14534.1712182016. The cubic root of 211242133 is about 595.5618194603.

Adding to 211242133 its reverse (331242112), we get a palindrome (542484245).

The spelling of 211242133 in words is "two hundred eleven million, two hundred forty-two thousand, one hundred thirty-three".