20411453221 has 2 divisors, whose sum is σ = 20411453222. Its totient is φ = 20411453220.

The previous prime is 20411453213. The next prime is 20411453261. The reversal of 20411453221 is 12235411402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19114445025 + 1297008196 = 138255^2 + 36014^2 .

It is a cyclic number.

It is not a de Polignac number, because 20411453221 - 2³ = 20411453213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20411453261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10205726610 + 10205726611.

It is an arithmetic number, because the mean of its divisors is an integer number (10205726611).

Almost surely, 2^20411453221 is an apocalyptic number.

It is an amenable number.

20411453221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20411453221 is an equidigital number, since it uses as much as digits as its factorization.

20411453221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 20411453221 its reverse (12235411402), we get a palindrome (32646864623).

The spelling of 20411453221 in words is "twenty billion, four hundred eleven million, four hundred fifty-three thousand, two hundred twenty-one".