11211100231 has 4 divisors (see below), whose sum is σ = 11211527872. Its totient is φ = 11210672592.

The previous prime is 11211100181. The next prime is 11211100249. The reversal of 11211100231 is 13200111211.

It is a happy number.

11211100231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13200111211 = 7 ⋅1885730173.

It is a cyclic number.

It is not a de Polignac number, because 11211100231 - 2⁹ = 11211099719 is a prime.

It is a super-2 number, since 2×11211100231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211100031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171735 + ... + 227848.

It is an arithmetic number, because the mean of its divisors is an integer number (2802881968).

Almost surely, 2^11211100231 is an apocalyptic number.

11211100231 is a deficient number, since it is larger than the sum of its proper divisors (427641).

11211100231 is an equidigital number, since it uses as much as digits as its factorization.

11211100231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427640.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 11211100231 its reverse (13200111211), we get a palindrome (24411211442).

The spelling of 11211100231 in words is "eleven billion, two hundred eleven million, one hundred thousand, two hundred thirty-one".