21322241 has 2 divisors, whose sum is σ = 21322242. Its totient is φ = 21322240.

The previous prime is 21322229. The next prime is 21322277. The reversal of 21322241 is 14222312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11082241 + 10240000 = 3329^2 + 3200^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322241 - 2¹⁰ = 21321217 is a prime.

It is a super-3 number, since 3×21322241³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21322201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661120 + 10661121.

It is an arithmetic number, because the mean of its divisors is an integer number (10661121).

Almost surely, 2^21322241 is an apocalyptic number.

It is an amenable number.

21322241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322241 is an equidigital number, since it uses as much as digits as its factorization.

21322241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 17.

The square root of 21322241 is about 4617.6012170823. The cubic root of 21322241 is about 277.2964326918.

Adding to 21322241 its reverse (14222312), we get a palindrome (35544553).

The spelling of 21322241 in words is "twenty-one million, three hundred twenty-two thousand, two hundred forty-one".