2111212133 has 4 divisors (see below), whose sum is σ = 2235401100. Its totient is φ = 1987023168.

The previous prime is 2111212097. The next prime is 2111212157. The reversal of 2111212133 is 3312121112.

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 1973314084 + 137898049 = 44422^2 + 11743^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111212133 - 2⁸ = 2111211877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 124188949 = 2111212133 / (2 + 1 + 1 + 1 + 2 + 1 + 2 + 1 + 3 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111212183) 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, 62094458 + ... + 62094491.

It is an arithmetic number, because the mean of its divisors is an integer number (558850275).

Almost surely, 2^2111212133 is an apocalyptic number.

It is an amenable number.

2111212133 is a deficient number, since it is larger than the sum of its proper divisors (124188967).

2111212133 is a wasteful number, since it uses less digits than its factorization.

2111212133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124188966.

The product of its digits is 72, while the sum is 17.

The square root of 2111212133 is about 45947.9284951999. The cubic root of 2111212133 is about 1282.8541723547.

Adding to 2111212133 its reverse (3312121112), we get a palindrome (5423333245).

The spelling of 2111212133 in words is "two billion, one hundred eleven million, two hundred twelve thousand, one hundred thirty-three".