1231221343 has 12 divisors (see below), whose sum is σ = 1357637400. Its totient is φ = 1115726480.

The previous prime is 1231221317. The next prime is 1231221359. The reversal of 1231221343 is 3431221321.

It is a de Polignac number, because none of the positive numbers 2^k-1231221343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231221443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22308 + ... + 54406.

It is an arithmetic number, because the mean of its divisors is an integer number (113136450).

Almost surely, 2^1231221343 is an apocalyptic number.

1231221343 is a deficient number, since it is larger than the sum of its proper divisors (126416057).

1231221343 is a wasteful number, since it uses less digits than its factorization.

1231221343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32438 (or 32427 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 1231221343 is about 35088.7637713271. The cubic root of 1231221343 is about 1071.7957857895.

Subtracting from 1231221343 its sum of digits (22), we obtain a palindrome (1231221321).

Adding to 1231221343 its reverse (3431221321), we get a palindrome (4662442664).

The spelling of 1231221343 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, three hundred forty-three".