1321123231 has 8 divisors (see below), whose sum is σ = 1329229440. Its totient is φ = 1313042328.

The previous prime is 1321123211. The next prime is 1321123247. The reversal of 1321123231 is 1323211231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321123231 - 2²³ = 1312734623 is a prime.

It is a super-2 number, since 2×1321123231² = 3490733182975758722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321123199 and 1321123208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321123211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104220 + ... + 116206.

It is an arithmetic number, because the mean of its divisors is an integer number (166153680).

Almost surely, 2^1321123231 is an apocalyptic number.

1321123231 is a deficient number, since it is larger than the sum of its proper divisors (8106209).

1321123231 is a wasteful number, since it uses less digits than its factorization.

1321123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12653.

The product of its digits is 216, while the sum is 19.

The square root of 1321123231 is about 36347.2589200341. The cubic root of 1321123231 is about 1097.2723689777.

Adding to 1321123231 its reverse (1323211231), we get a palindrome (2644334462).

The spelling of 1321123231 in words is "one billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred thirty-one".