20121211333 has 4 divisors (see below), whose sum is σ = 20225466508. Its totient is φ = 20016956160.

The previous prime is 20121211273. The next prime is 20121211361. The reversal of 20121211333 is 33311212102.

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 4209154884 + 15912056449 = 64878^2 + 126143^2 .

It is a cyclic number.

It is not a de Polignac number, because 20121211333 - 2¹⁷ = 20121080261 is a prime.

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 20121211333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121221333) 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, 52127298 + ... + 52127683.

It is an arithmetic number, because the mean of its divisors is an integer number (5056366627).

Almost surely, 2^20121211333 is an apocalyptic number.

It is an amenable number.

20121211333 is a deficient number, since it is larger than the sum of its proper divisors (104255175).

20121211333 is a wasteful number, since it uses less digits than its factorization.

20121211333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104255174.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20121211333 its reverse (33311212102), we get a palindrome (53432423435).

The spelling of 20121211333 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, three hundred thirty-three".