11231112121 has 2 divisors, whose sum is σ = 11231112122. Its totient is φ = 11231112120.

The previous prime is 11231112103. The next prime is 11231112133. The reversal of 11231112121 is 12121113211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10595820096 + 635292025 = 102936^2 + 25205^2 .

It is an emirp because it is prime and its reverse (12121113211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11231112121 - 2¹³ = 11231103929 is a prime.

It is a super-2 number, since 2×11231112121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11231112095 and 11231112104.

It is not a weakly prime, because it can be changed into another prime (11231112421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615556060 + 5615556061.

It is an arithmetic number, because the mean of its divisors is an integer number (5615556061).

Almost surely, 2^11231112121 is an apocalyptic number.

It is an amenable number.

11231112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231112121 is an equidigital number, since it uses as much as digits as its factorization.

11231112121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 16.

Adding to 11231112121 its reverse (12121113211), we get a palindrome (23352225332).

The spelling of 11231112121 in words is "eleven billion, two hundred thirty-one million, one hundred twelve thousand, one hundred twenty-one".