21213322133 has 8 divisors (see below), whose sum is σ = 21706348248. Its totient is φ = 20723732224.

The previous prime is 21213322111. The next prime is 21213322153. The reversal of 21213322133 is 33122331212.

It can be written as a sum of positive squares in 4 ways, for example, as 8720209 + 21204601924 = 2953^2 + 145618^2 .

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 21213322133 - 2¹⁰ = 21213321109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213322099 and 21213322108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213322153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846560 + ... + 871257.

It is an arithmetic number, because the mean of its divisors is an integer number (2713293531).

Almost surely, 2^21213322133 is an apocalyptic number.

It is an amenable number.

21213322133 is a deficient number, since it is larger than the sum of its proper divisors (493026115).

21213322133 is a wasteful number, since it uses less digits than its factorization.

21213322133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718103.

The product of its digits is 1296, while the sum is 23.

Adding to 21213322133 its reverse (33122331212), we get a palindrome (54335653345).

The spelling of 21213322133 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty-two thousand, one hundred thirty-three".