20332131221 has 2 divisors, whose sum is σ = 20332131222. Its totient is φ = 20332131220.

The previous prime is 20332131203. The next prime is 20332131227. The reversal of 20332131221 is 12213123302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18438924100 + 1893207121 = 135790^2 + 43511^2 .

It is a cyclic number.

It is not a de Polignac number, because 20332131221 - 2³⁴ = 3152262037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20332131193 and 20332131202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20332131227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10166065610 + 10166065611.

It is an arithmetic number, because the mean of its divisors is an integer number (10166065611).

Almost surely, 2^20332131221 is an apocalyptic number.

It is an amenable number.

20332131221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20332131221 is an equidigital number, since it uses as much as digits as its factorization.

20332131221 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 20332131221 its reverse (12213123302), we get a palindrome (32545254523).

The spelling of 20332131221 in words is "twenty billion, three hundred thirty-two million, one hundred thirty-one thousand, two hundred twenty-one".