1121849221 has 4 divisors (see below), whose sum is σ = 1123627744. Its totient is φ = 1120070700.

The previous prime is 1121849207. The next prime is 1121849249. The reversal of 1121849221 is 1229481211.

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 1121849221 - 2⁵ = 1121849189 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 (1121849291) 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, 888315 + ... + 889576.

It is an arithmetic number, because the mean of its divisors is an integer number (280906936).

Almost surely, 2^1121849221 is an apocalyptic number.

It is an amenable number.

1121849221 is a deficient number, since it is larger than the sum of its proper divisors (1778523).

1121849221 is an equidigital number, since it uses as much as digits as its factorization.

1121849221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778522.

The product of its digits is 2304, while the sum is 31.

The square root of 1121849221 is about 33494.0176897308. The cubic root of 1121849221 is about 1039.0700578315.

The spelling of 1121849221 in words is "one billion, one hundred twenty-one million, eight hundred forty-nine thousand, two hundred twenty-one".