1221133988 has 12 divisors (see below), whose sum is σ = 2138315760. Its totient is φ = 610186632.

The previous prime is 1221133957. The next prime is 1221133993. The reversal of 1221133988 is 8893311221.

It is a super-3 number, since 3×1221133988³ (a number of 28 digits) contains 333 as substring.

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, 87806 + ... + 100757.

It is an arithmetic number, because the mean of its divisors is an integer number (178192980).

Almost surely, 2^1221133988 is an apocalyptic number.

It is an amenable number.

1221133988 is a deficient number, since it is larger than the sum of its proper divisors (917181772).

1221133988 is a wasteful number, since it uses less digits than its factorization.

1221133988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190186 (or 190184 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 1221133988 is about 34944.7276137617. The cubic root of 1221133988 is about 1068.8606931710.

The spelling of 1221133988 in words is "one billion, two hundred twenty-one million, one hundred thirty-three thousand, nine hundred eighty-eight".