1121565221 has 8 divisors (see below), whose sum is σ = 1282017600. Its totient is φ = 961170048.

The previous prime is 1121565217. The next prime is 1121565223. The reversal of 1121565221 is 1225651211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1121565221 - 2² = 1121565217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121565223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43070 + ... + 64016.

It is an arithmetic number, because the mean of its divisors is an integer number (160252200).

Almost surely, 2^1121565221 is an apocalyptic number.

It is an amenable number.

1121565221 is a deficient number, since it is larger than the sum of its proper divisors (160452379).

1121565221 is an equidigital number, since it uses as much as digits as its factorization.

1121565221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28603.

The product of its digits is 1200, while the sum is 26.

The square root of 1121565221 is about 33489.7778583257. Note that the first 3 decimals coincide. The cubic root of 1121565221 is about 1038.9823690418.

The spelling of 1121565221 in words is "one billion, one hundred twenty-one million, five hundred sixty-five thousand, two hundred twenty-one".