20532303221 has 2 divisors, whose sum is σ = 20532303222. Its totient is φ = 20532303220.

The previous prime is 20532303217. The next prime is 20532303223. The reversal of 20532303221 is 12230323502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20453004196 + 79299025 = 143014^2 + 8905^2 .

It is a cyclic number.

It is not a de Polignac number, because 20532303221 - 2² = 20532303217 is a prime.

Together with 20532303223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20532303223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266151610 + 10266151611.

It is an arithmetic number, because the mean of its divisors is an integer number (10266151611).

Almost surely, 2^20532303221 is an apocalyptic number.

It is an amenable number.

20532303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20532303221 is an equidigital number, since it uses as much as digits as its factorization.

20532303221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 20532303221 its reverse (12230323502), we get a palindrome (32762626723).

The spelling of 20532303221 in words is "twenty billion, five hundred thirty-two million, three hundred three thousand, two hundred twenty-one".