1221332144 has 20 divisors (see below), whose sum is σ = 2377552440. Its totient is φ = 607770240.

The previous prime is 1221332111. The next prime is 1221332153. The reversal of 1221332144 is 4412331221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177509 + ... + 184260.

It is an arithmetic number, because the mean of its divisors is an integer number (118877622).

Almost surely, 2^1221332144 is an apocalyptic number.

It is an amenable number.

1221332144 is a deficient number, since it is larger than the sum of its proper divisors (1156220296).

1221332144 is a wasteful number, since it uses less digits than its factorization.

1221332144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361988 (or 361982 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 1221332144 is about 34947.5627762509. The cubic root of 1221332144 is about 1068.9185054739.

Adding to 1221332144 its reverse (4412331221), we get a palindrome (5633663365).

The spelling of 1221332144 in words is "one billion, two hundred twenty-one million, three hundred thirty-two thousand, one hundred forty-four".