1121221009 has 16 divisors (see below), whose sum is σ = 1211569920. Its totient is φ = 1033793280.

The previous prime is 1121220967. The next prime is 1121221019. The reversal of 1121221009 is 9001221211.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121221009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121221019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172747 + ... + 179119.

It is an arithmetic number, because the mean of its divisors is an integer number (75723120).

Almost surely, 2^1121221009 is an apocalyptic number.

It is an amenable number.

1121221009 is a deficient number, since it is larger than the sum of its proper divisors (90348911).

1121221009 is a wasteful number, since it uses less digits than its factorization.

1121221009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6600.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1121221009 is about 33484.6384033037. The cubic root of 1121221009 is about 1038.8760691481.

The spelling of 1121221009 in words is "one billion, one hundred twenty-one million, two hundred twenty-one thousand, nine".