1121221988 has 12 divisors (see below), whose sum is σ = 1962641520. Its totient is φ = 560467272.

The previous prime is 1121221987. The next prime is 1121221993. The reversal of 1121221988 is 8891221211.

It is not an unprimeable number, because it can be changed into a prime (1121221987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17306 + ... + 50417.

It is an arithmetic number, because the mean of its divisors is an integer number (163553460).

Almost surely, 2^1121221988 is an apocalyptic number.

It is an amenable number.

1121221988 is a deficient number, since it is larger than the sum of its proper divisors (841419532).

1121221988 is a wasteful number, since it uses less digits than its factorization.

1121221988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71866 (or 71864 counting only the distinct ones).

The product of its digits is 4608, while the sum is 35.

The square root of 1121221988 is about 33484.6530219442. The cubic root of 1121221988 is about 1038.8763715147.

The spelling of 1121221988 in words is "one billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred eighty-eight".