1221143132 has 72 divisors (see below), whose sum is σ = 2408683200. Its totient is φ = 541157760.

The previous prime is 1221143113. The next prime is 1221143179. The reversal of 1221143132 is 2313411221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4167578 + ... + 4167870.

Almost surely, 2^1221143132 is an apocalyptic number.

It is an amenable number.

1221143132 is a deficient number, since it is larger than the sum of its proper divisors (1187540068).

1221143132 is a wasteful number, since it uses less digits than its factorization.

1221143132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 494 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 1221143132 is about 34944.8584487046. The cubic root of 1221143132 is about 1068.8633610840.

Adding to 1221143132 its reverse (2313411221), we get a palindrome (3534554353).

The spelling of 1221143132 in words is "one billion, two hundred twenty-one million, one hundred forty-three thousand, one hundred thirty-two".