20213313221 has 2 divisors, whose sum is σ = 20213313222. Its totient is φ = 20213313220.

The previous prime is 20213313209. The next prime is 20213313271. The reversal of 20213313221 is 12231331202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15512702500 + 4700610721 = 124550^2 + 68561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213313221 - 2¹⁸ = 20213051077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20213313193 and 20213313202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213313271) 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 as a sum of consecutive naturals, namely, 10106656610 + 10106656611.

It is an arithmetic number, because the mean of its divisors is an integer number (10106656611).

Almost surely, 2^20213313221 is an apocalyptic number.

It is an amenable number.

20213313221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213313221 is an equidigital number, since it uses as much as digits as its factorization.

20213313221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20213313221 its reverse (12231331202), we get a palindrome (32444644423).

The spelling of 20213313221 in words is "twenty billion, two hundred thirteen million, three hundred thirteen thousand, two hundred twenty-one".