20333213221 has 4 divisors (see below), whose sum is σ = 20334582252. Its totient is φ = 20331844192.

The previous prime is 20333213213. The next prime is 20333213231. The reversal of 20333213221 is 12231233302.

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 15534880321 + 4798332900 = 124639^2 + 69270^2 .

It is a cyclic number.

It is not a de Polignac number, because 20333213221 - 2³ = 20333213213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20333213192 and 20333213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20333213231) 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 3 ways as a sum of consecutive naturals, for example, 661990 + ... + 692023.

It is an arithmetic number, because the mean of its divisors is an integer number (5083645563).

Almost surely, 2^20333213221 is an apocalyptic number.

It is an amenable number.

20333213221 is a deficient number, since it is larger than the sum of its proper divisors (1369031).

20333213221 is a wasteful number, since it uses less digits than its factorization.

20333213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369030.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20333213221 its reverse (12231233302), we get a palindrome (32564446523).

The spelling of 20333213221 in words is "twenty billion, three hundred thirty-three million, two hundred thirteen thousand, two hundred twenty-one".