21241201211 has 2 divisors, whose sum is σ = 21241201212. Its totient is φ = 21241201210.

The previous prime is 21241201199. The next prime is 21241201273. The reversal of 21241201211 is 11210214212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21241201211 - 2¹⁴ = 21241184827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21241201211.

It is not a weakly prime, because it can be changed into another prime (21241204211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620600605 + 10620600606.

It is an arithmetic number, because the mean of its divisors is an integer number (10620600606).

Almost surely, 2^21241201211 is an apocalyptic number.

21241201211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241201211 is an equidigital number, since it uses as much as digits as its factorization.

21241201211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21241201211 its reverse (11210214212), we get a palindrome (32451415423).

The spelling of 21241201211 in words is "twenty-one billion, two hundred forty-one million, two hundred one thousand, two hundred eleven".