21124244041 has 2 divisors, whose sum is σ = 21124244042. Its totient is φ = 21124244040.

The previous prime is 21124243999. The next prime is 21124244051. The reversal of 21124244041 is 14044242112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20477610000 + 646634041 = 143100^2 + 25429^2 .

It is a cyclic number.

It is not a de Polignac number, because 21124244041 - 2¹¹ = 21124241993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21124243997 and 21124244015.

It is not a weakly prime, because it can be changed into another prime (21124244051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562122020 + 10562122021.

It is an arithmetic number, because the mean of its divisors is an integer number (10562122021).

Almost surely, 2^21124244041 is an apocalyptic number.

It is an amenable number.

21124244041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124244041 is an equidigital number, since it uses as much as digits as its factorization.

21124244041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21124244041 its reverse (14044242112), we get a palindrome (35168486153).

The spelling of 21124244041 in words is "twenty-one billion, one hundred twenty-four million, two hundred forty-four thousand, forty-one".