21103120211 has 2 divisors, whose sum is σ = 21103120212. Its totient is φ = 21103120210.

The previous prime is 21103120201. The next prime is 21103120217. The reversal of 21103120211 is 11202130112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21103120211 - 2⁶ = 21103120147 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103120217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551560105 + 10551560106.

It is an arithmetic number, because the mean of its divisors is an integer number (10551560106).

Almost surely, 2^21103120211 is an apocalyptic number.

21103120211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103120211 is an equidigital number, since it uses as much as digits as its factorization.

21103120211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21103120211 its reverse (11202130112), we get a palindrome (32305250323).

Subtracting from 21103120211 its reverse (11202130112), we obtain a palindrome (9900990099).

The spelling of 21103120211 in words is "twenty-one billion, one hundred three million, one hundred twenty thousand, two hundred eleven".