1321332231 has 4 divisors (see below), whose sum is σ = 1761776312. Its totient is φ = 880888152.

The previous prime is 1321332217. The next prime is 1321332239. The reversal of 1321332231 is 1322331231.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1321332231 - 2⁹ = 1321331719 is a prime.

It is a super-2 number, since 2×1321332231² = 3491837729358874722, 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 = 1321332198 and 1321332207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321332239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220222036 + ... + 220222041.

It is an arithmetic number, because the mean of its divisors is an integer number (440444078).

Almost surely, 2^1321332231 is an apocalyptic number.

1321332231 is a deficient number, since it is larger than the sum of its proper divisors (440444081).

1321332231 is an equidigital number, since it uses as much as digits as its factorization.

1321332231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440444080.

The product of its digits is 648, while the sum is 21.

The square root of 1321332231 is about 36350.1338511979. The cubic root of 1321332231 is about 1097.3302282870.

Adding to 1321332231 its reverse (1322331231), we get a palindrome (2643663462).

The spelling of 1321332231 in words is "one billion, three hundred twenty-one million, three hundred thirty-two thousand, two hundred thirty-one".