1323212331 has 16 divisors (see below), whose sum is σ = 2016831744. Its totient is φ = 755930784.

The previous prime is 1323212281. The next prime is 1323212347. The reversal of 1323212331 is 1332123231.

It is not a de Polignac number, because 1323212331 - 2²³ = 1314823723 is a prime.

It is a super-2 number, since 2×1323212331² = 3501781745820907122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1323212298 and 1323212307.

It is not an unprimeable number, because it can be changed into a prime (1323212131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158836 + ... + 166958.

It is an arithmetic number, because the mean of its divisors is an integer number (126051984).

Almost surely, 2^1323212331 is an apocalyptic number.

1323212331 is a deficient number, since it is larger than the sum of its proper divisors (693619413).

1323212331 is an equidigital number, since it uses as much as digits as its factorization.

1323212331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15890.

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

The square root of 1323212331 is about 36375.9856361309. The cubic root of 1323212331 is about 1097.8504388178.

Adding to 1323212331 its reverse (1332123231), we get a palindrome (2655335562).

The spelling of 1323212331 in words is "one billion, three hundred twenty-three million, two hundred twelve thousand, three hundred thirty-one".