21212211133 has 8 divisors (see below), whose sum is σ = 21444845688. Its totient is φ = 20979861504.

The previous prime is 21212211131. The next prime is 21212211143. The reversal of 21212211133 is 33111221212.

It can be written as a sum of positive squares in 4 ways, for example, as 135559449 + 21076651684 = 11643^2 + 145178^2 .

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

It is not a de Polignac number, because 21212211133 - 2¹ = 21212211131 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 21212211133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212211131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80235 + ... + 221047.

It is an arithmetic number, because the mean of its divisors is an integer number (2680605711).

Almost surely, 2^21212211133 is an apocalyptic number.

It is an amenable number.

21212211133 is a deficient number, since it is larger than the sum of its proper divisors (232634555).

21212211133 is a wasteful number, since it uses less digits than its factorization.

21212211133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142463.

The product of its digits is 144, while the sum is 19.

Adding to 21212211133 its reverse (33111221212), we get a palindrome (54323432345).

The spelling of 21212211133 in words is "twenty-one billion, two hundred twelve million, two hundred eleven thousand, one hundred thirty-three".