21212011333333 has 8 divisors (see below), whose sum is σ = 22460242225752. Its totient is φ = 19963832165376.

The previous prime is 21212011333313. The next prime is 21212011333421. The reversal of 21212011333333 is 33333311021212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12500877492964 + 8711133840369 = 3535658^2 + 2951463^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21212011333333 - 2³³ = 21203421398741 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 (21212011333313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12085210 + ... + 13728667.

It is an arithmetic number, because the mean of its divisors is an integer number (2807530278219).

Almost surely, 2^{21212011333333} is an apocalyptic number.

It is an amenable number.

21212011333333 is a deficient number, since it is larger than the sum of its proper divisors (1248230892419).

21212011333333 is a wasteful number, since it uses less digits than its factorization.

21212011333333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25862231.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21212011333333 its reverse (33333311021212), we get a palindrome (54545322354545).

The spelling of 21212011333333 in words is "twenty-one trillion, two hundred twelve billion, eleven million, three hundred thirty-three thousand, three hundred thirty-three".