21441220133 has 2 divisors, whose sum is σ = 21441220134. Its totient is φ = 21441220132.

The previous prime is 21441220061. The next prime is 21441220139. The reversal of 21441220133 is 33102214412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15044739649 + 6396480484 = 122657^2 + 79978^2 .

It is a cyclic number.

It is not a de Polignac number, because 21441220133 - 2¹⁰ = 21441219109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21441220099 and 21441220108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21441220139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720610066 + 10720610067.

It is an arithmetic number, because the mean of its divisors is an integer number (10720610067).

Almost surely, 2^21441220133 is an apocalyptic number.

It is an amenable number.

21441220133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441220133 is an equidigital number, since it uses as much as digits as its factorization.

21441220133 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 21441220133 its reverse (33102214412), we get a palindrome (54543434545).

The spelling of 21441220133 in words is "twenty-one billion, four hundred forty-one million, two hundred twenty thousand, one hundred thirty-three".