20441233121 has 2 divisors, whose sum is σ = 20441233122. Its totient is φ = 20441233120.

The previous prime is 20441233051. The next prime is 20441233139. The reversal of 20441233121 is 12133214402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20437847521 + 3385600 = 142961^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20441233121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20441233171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220616560 + 10220616561.

It is an arithmetic number, because the mean of its divisors is an integer number (10220616561).

Almost surely, 2^20441233121 is an apocalyptic number.

It is an amenable number.

20441233121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20441233121 is an equidigital number, since it uses as much as digits as its factorization.

20441233121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20441233121 its reverse (12133214402), we get a palindrome (32574447523).

The spelling of 20441233121 in words is "twenty billion, four hundred forty-one million, two hundred thirty-three thousand, one hundred twenty-one".