1121242221 has 24 divisors (see below), whose sum is σ = 1767916800. Its totient is φ = 679113600.

The previous prime is 1121242219. The next prime is 1121242229. The reversal of 1121242221 is 1222421211.

1121242221 is a `hidden beast` number, since 11 + 212 + 422 + 21 = 666.

It is not a de Polignac number, because 1121242221 - 2¹ = 1121242219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121242194 and 1121242203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121242229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235141 + ... + 239861.

It is an arithmetic number, because the mean of its divisors is an integer number (73663200).

Almost surely, 2^1121242221 is an apocalyptic number.

1121242221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121242221 is a deficient number, since it is larger than the sum of its proper divisors (646674579).

1121242221 is a wasteful number, since it uses less digits than its factorization.

1121242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137 (or 7134 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 1121242221 is about 33484.9551440643. The cubic root of 1121242221 is about 1038.8826204881.

Adding to 1121242221 its reverse (1222421211), we get a palindrome (2343663432).

It can be divided in two parts, 1121 and 242221, that added together give a palindrome (243342).

The spelling of 1121242221 in words is "one billion, one hundred twenty-one million, two hundred forty-two thousand, two hundred twenty-one".