11232121211 has 2 divisors, whose sum is σ = 11232121212. Its totient is φ = 11232121210.

The previous prime is 11232121207. The next prime is 11232121249. The reversal of 11232121211 is 11212123211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11232121211 - 2² = 11232121207 is a prime.

It is a super-2 number, since 2×11232121211² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11232121211.

It is not a weakly prime, because it can be changed into another prime (11232921211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5616060605 + 5616060606.

It is an arithmetic number, because the mean of its divisors is an integer number (5616060606).

Almost surely, 2^11232121211 is an apocalyptic number.

11232121211 is a deficient number, since it is larger than the sum of its proper divisors (1).

11232121211 is an equidigital number, since it uses as much as digits as its factorization.

11232121211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 17.

Adding to 11232121211 its reverse (11212123211), we get a palindrome (22444244422).

The spelling of 11232121211 in words is "eleven billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred eleven".