1121100221 has 4 divisors (see below), whose sum is σ = 1122456672. Its totient is φ = 1119743772.

The previous prime is 1121100193. The next prime is 1121100289. The reversal of 1121100221 is 1220011211.

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.

It is a cyclic number.

It is not a de Polignac number, because 1121100221 - 2¹⁴ = 1121083837 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 (1121100521) 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, 676985 + ... + 678638.

It is an arithmetic number, because the mean of its divisors is an integer number (280614168).

Almost surely, 2^1121100221 is an apocalyptic number.

It is an amenable number.

1121100221 is a deficient number, since it is larger than the sum of its proper divisors (1356451).

1121100221 is an equidigital number, since it uses as much as digits as its factorization.

1121100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356450.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1121100221 is about 33482.8347216899. The cubic root of 1121100221 is about 1038.8387621206.

Adding to 1121100221 its reverse (1220011211), we get a palindrome (2341111432).

The spelling of 1121100221 in words is "one billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-one".