1221131132 has 18 divisors (see below), whose sum is σ = 2314008648. Its totient is φ = 563598672.

The previous prime is 1221131113. The next prime is 1221131141. The reversal of 1221131132 is 2311311221.

It is a super-2 number, since 2×1221131132² = 2982322483079202848, 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 1221131132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 902528 + ... + 903879.

It is an arithmetic number, because the mean of its divisors is an integer number (128556036).

Almost surely, 2^1221131132 is an apocalyptic number.

It is an amenable number.

1221131132 is a deficient number, since it is larger than the sum of its proper divisors (1092877516).

1221131132 is a wasteful number, since it uses less digits than its factorization.

1221131132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806437 (or 1806422 counting only the distinct ones).

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

The square root of 1221131132 is about 34944.6867492041. The cubic root of 1221131132 is about 1068.8598598831.

Adding to 1221131132 its reverse (2311311221), we get a palindrome (3532442353).

The spelling of 1221131132 in words is "one billion, two hundred twenty-one million, one hundred thirty-one thousand, one hundred thirty-two".