21241320211 has 4 divisors (see below), whose sum is σ = 21336572992. Its totient is φ = 21146067432.

The previous prime is 21241320179. The next prime is 21241320229. The reversal of 21241320211 is 11202314212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21241320211 - 2⁵ = 21241320179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21241320511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47626056 + ... + 47626501.

It is an arithmetic number, because the mean of its divisors is an integer number (5334143248).

Almost surely, 2^21241320211 is an apocalyptic number.

21241320211 is a deficient number, since it is larger than the sum of its proper divisors (95252781).

21241320211 is an equidigital number, since it uses as much as digits as its factorization.

21241320211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95252780.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21241320211 its reverse (11202314212), we get a palindrome (32443634423).

The spelling of 21241320211 in words is "twenty-one billion, two hundred forty-one million, three hundred twenty thousand, two hundred eleven".