11121222231 has 36 divisors (see below), whose sum is σ = 19785909312. Its totient is φ = 5981157504.

The previous prime is 11121222199. The next prime is 11121222239. The reversal of 11121222231 is 13222212111.

It is not a de Polignac number, because 11121222231 - 2⁵ = 11121222199 is a prime.

It is a super-2 number, since 2×11121222231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121222239) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 734215 + ... + 749208.

It is an arithmetic number, because the mean of its divisors is an integer number (549608592).

Almost surely, 2^11121222231 is an apocalyptic number.

11121222231 is a deficient number, since it is larger than the sum of its proper divisors (8664687081).

11121222231 is a wasteful number, since it uses less digits than its factorization.

11121222231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483460 (or 1483450 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 11121222231 its reverse (13222212111), we get a palindrome (24343434342).

The spelling of 11121222231 in words is "eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred thirty-one".