111320121231 has 64 divisors (see below), whose sum is σ = 191509056000. Its totient is φ = 63197418240.

The previous prime is 111320121223. The next prime is 111320121329. The reversal of 111320121231 is 132121023111.

111320121231 is a `hidden beast` number, since 111 + 320 + 1 + 2 + 1 + 231 = 666.

It is not a de Polignac number, because 111320121231 - 2³ = 111320121223 is a prime.

It is a super-2 number, since 2×111320121231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111320121131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 391401 + ... + 613053.

It is an arithmetic number, because the mean of its divisors is an integer number (2992329000).

Almost surely, 2^111320121231 is an apocalyptic number.

111320121231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111320121231 is a deficient number, since it is larger than the sum of its proper divisors (80188934769).

111320121231 is a wasteful number, since it uses less digits than its factorization.

111320121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221781 (or 221775 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 111320121231 its reverse (132121023111), we get a palindrome (243441144342).

The spelling of 111320121231 in words is "one hundred eleven billion, three hundred twenty million, one hundred twenty-one thousand, two hundred thirty-one".