20322332221 has 2 divisors, whose sum is σ = 20322332222. Its totient is φ = 20322332220.

The previous prime is 20322332153. The next prime is 20322332257. The reversal of 20322332221 is 12223322302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16508652196 + 3813680025 = 128486^2 + 61755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20322332221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20322332192 and 20322332201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20322332521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161166110 + 10161166111.

It is an arithmetic number, because the mean of its divisors is an integer number (10161166111).

Almost surely, 2^20322332221 is an apocalyptic number.

It is an amenable number.

20322332221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20322332221 is an equidigital number, since it uses as much as digits as its factorization.

20322332221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20322332221 its reverse (12223322302), we get a palindrome (32545654523).

The spelling of 20322332221 in words is "twenty billion, three hundred twenty-two million, three hundred thirty-two thousand, two hundred twenty-one".