21442021241 has 2 divisors, whose sum is σ = 21442021242. Its totient is φ = 21442021240.

The previous prime is 21442021201. The next prime is 21442021253. The reversal of 21442021241 is 14212024412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17445126400 + 3996894841 = 132080^2 + 63221^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442021241 - 2⁶ = 21442021177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21442021201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721010620 + 10721010621.

It is an arithmetic number, because the mean of its divisors is an integer number (10721010621).

Almost surely, 2^21442021241 is an apocalyptic number.

It is an amenable number.

21442021241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442021241 is an equidigital number, since it uses as much as digits as its factorization.

21442021241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21442021241 its reverse (14212024412), we get a palindrome (35654045653).

The spelling of 21442021241 in words is "twenty-one billion, four hundred forty-two million, twenty-one thousand, two hundred forty-one".