11721430211 has 2 divisors, whose sum is σ = 11721430212. Its totient is φ = 11721430210.

The previous prime is 11721430169. The next prime is 11721430219. The reversal of 11721430211 is 11203412711.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11721430211 is a prime.

It is not a weakly prime, because it can be changed into another prime (11721430219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860715105 + 5860715106.

It is an arithmetic number, because the mean of its divisors is an integer number (5860715106).

Almost surely, 2^11721430211 is an apocalyptic number.

11721430211 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721430211 is an equidigital number, since it uses as much as digits as its factorization.

11721430211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 11721430211 its reverse (11203412711), we get a palindrome (22924842922).

The spelling of 11721430211 in words is "eleven billion, seven hundred twenty-one million, four hundred thirty thousand, two hundred eleven".