1321111231 has 32 divisors (see below), whose sum is σ = 1516838400. Its totient is φ = 1140048000.

The previous prime is 1321111223. The next prime is 1321111261.

It is a happy number.

1321111231 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1321111231 - 2³ = 1321111223 is a prime.

It is a super-2 number, since 2×1321111231² = 3490669769348670722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321111261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3785245 + ... + 3785593.

It is an arithmetic number, because the mean of its divisors is an integer number (47401200).

Almost surely, 2^1321111231 is an apocalyptic number.

1321111231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321111231 is a deficient number, since it is larger than the sum of its proper divisors (195727169).

1321111231 is a wasteful number, since it uses less digits than its factorization.

1321111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its digits is 36, while the sum is 16.

The square root of 1321111231 is about 36347.0938453131. The cubic root of 1321111231 is about 1097.2690467269.

It can be divided in two parts, 13211 and 11231, that added together give a palindrome (24442).

The spelling of 1321111231 in words is "one billion, three hundred twenty-one million, one hundred eleven thousand, two hundred thirty-one".