1110221209 has 4 divisors (see below), whose sum is σ = 1110323200. Its totient is φ = 1110119220.

The previous prime is 1110221191. The next prime is 1110221237. The reversal of 1110221209 is 9021220111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9021220111 = 101 ⋅89319011.

It is a cyclic number.

It is not a de Polignac number, because 1110221209 - 2¹⁹ = 1109696921 is a prime.

It is a super-2 number, since 2×1110221209² = 2465182265826843362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1110221269) 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, 32409 + ... + 57190.

It is an arithmetic number, because the mean of its divisors is an integer number (277580800).

Almost surely, 2^1110221209 is an apocalyptic number.

It is an amenable number.

1110221209 is a deficient number, since it is larger than the sum of its proper divisors (101991).

1110221209 is an equidigital number, since it uses as much as digits as its factorization.

1110221209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101990.

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

The square root of 1110221209 is about 33319.9821278463. The cubic root of 1110221209 is about 1035.4675815208.

The spelling of 1110221209 in words is "one billion, one hundred ten million, two hundred twenty-one thousand, two hundred nine".