1311213321 has 12 divisors (see below), whose sum is σ = 2066154480. Its totient is φ = 794674680.

The previous prime is 1311213301. The next prime is 1311213347. The reversal of 1311213321 is 1233121131.

1311213321 is a `hidden beast` number, since 1 + 311 + 21 + 332 + 1 = 666.

It is not a de Polignac number, because 1311213321 - 2⁷ = 1311213193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311213294 and 1311213303.

It is not an unprimeable number, because it can be changed into a prime (1311213301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6622191 + ... + 6622388.

It is an arithmetic number, because the mean of its divisors is an integer number (172179540).

Almost surely, 2^1311213321 is an apocalyptic number.

1311213321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1311213321 is a deficient number, since it is larger than the sum of its proper divisors (754941159).

1311213321 is a wasteful number, since it uses less digits than its factorization.

1311213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13244596 (or 13244593 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1311213321 is about 36210.6796539364. The cubic root of 1311213321 is about 1094.5218879750.

Adding to 1311213321 its reverse (1233121131), we get a palindrome (2544334452).

The spelling of 1311213321 in words is "one billion, three hundred eleven million, two hundred thirteen thousand, three hundred twenty-one".