1312211321 has 16 divisors (see below), whose sum is σ = 1348574400. Its totient is φ = 1276430400.

The previous prime is 1312211311. The next prime is 1312211323. The reversal of 1312211321 is 1231122131.

It is a cyclic number.

It is not a de Polignac number, because 1312211321 - 2²² = 1308017017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312211321.

It is not an unprimeable number, because it can be changed into a prime (1312211323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3462110 + ... + 3462488.

It is an arithmetic number, because the mean of its divisors is an integer number (84285900).

Almost surely, 2^1312211321 is an apocalyptic number.

It is an amenable number.

1312211321 is a deficient number, since it is larger than the sum of its proper divisors (36363079).

1312211321 is a wasteful number, since it uses less digits than its factorization.

1312211321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

The product of its digits is 72, while the sum is 17.

The square root of 1312211321 is about 36224.4574976631. The cubic root of 1312211321 is about 1094.7995076445.

Adding to 1312211321 its reverse (1231122131), we get a palindrome (2543333452).

The spelling of 1312211321 in words is "one billion, three hundred twelve million, two hundred eleven thousand, three hundred twenty-one".