21204322441 has 2 divisors, whose sum is σ = 21204322442. Its totient is φ = 21204322440.

The previous prime is 21204322397. The next prime is 21204322453. The reversal of 21204322441 is 14422340212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20580771600 + 623550841 = 143460^2 + 24971^2 .

It is a cyclic number.

It is not a de Polignac number, because 21204322441 - 2¹⁷ = 21204191369 is a prime.

It is not a weakly prime, because it can be changed into another prime (21204320441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10602161220 + 10602161221.

It is an arithmetic number, because the mean of its divisors is an integer number (10602161221).

Almost surely, 2^21204322441 is an apocalyptic number.

It is an amenable number.

21204322441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21204322441 is an equidigital number, since it uses as much as digits as its factorization.

21204322441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21204322441 its reverse (14422340212), we get a palindrome (35626662653).

The spelling of 21204322441 in words is "twenty-one billion, two hundred four million, three hundred twenty-two thousand, four hundred forty-one".