1311221132 has 24 divisors (see below), whose sum is σ = 2480360400. Its totient is φ = 602922816.

The previous prime is 1311221111. The next prime is 1311221143. The reversal of 1311221132 is 2311221131.

It is a super-2 number, since 2×1311221132² = 3438601714006722848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1311221132.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32882 + ... + 60857.

It is an arithmetic number, because the mean of its divisors is an integer number (103348350).

Almost surely, 2^1311221132 is an apocalyptic number.

It is an amenable number.

1311221132 is a deficient number, since it is larger than the sum of its proper divisors (1169139268).

1311221132 is a wasteful number, since it uses less digits than its factorization.

1311221132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94025 (or 94023 counting only the distinct ones).

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

The square root of 1311221132 is about 36210.7875086969. The cubic root of 1311221132 is about 1094.5240613547.

Adding to 1311221132 its reverse (2311221131), we get a palindrome (3622442263).

Subtracting 1311221132 from its reverse (2311221131), we obtain a palindrome (999999999).

The spelling of 1311221132 in words is "one billion, three hundred eleven million, two hundred twenty-one thousand, one hundred thirty-two".