11111021231231 has 4 divisors (see below), whose sum is σ = 11111099313600. Its totient is φ = 11110943148864.

The previous prime is 11111021231203. The next prime is 11111021231239. The reversal of 11111021231231 is 13213212011111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111021231231 - 2¹⁰ = 11111021230207 is a prime.

It is a super-2 number, since 2×11111021231231² (a number of 27 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 (11111021231239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38827346 + ... + 39112463.

It is an arithmetic number, because the mean of its divisors is an integer number (2777774828400).

Almost surely, 2^{11111021231231} is an apocalyptic number.

11111021231231 is a deficient number, since it is larger than the sum of its proper divisors (78082369).

11111021231231 is an equidigital number, since it uses as much as digits as its factorization.

11111021231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78082368.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 11111021231231 its reverse (13213212011111), we get a palindrome (24324233242342).

The spelling of 11111021231231 in words is "eleven trillion, one hundred eleven billion, twenty-one million, two hundred thirty-one thousand, two hundred thirty-one".