1221134120 has 16 divisors (see below), whose sum is σ = 2747551860. Its totient is φ = 488453632.

The previous prime is 1221134099. The next prime is 1221134129. The reversal of 1221134120 is 214311221.

It can be written as a sum of positive squares in 2 ways, for example, as 1192597156 + 28536964 = 34534^2 + 5342^2 .

It is not an unprimeable number, because it can be changed into a prime (1221134129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15264137 + ... + 15264216.

Almost surely, 2^1221134120 is an apocalyptic number.

1221134120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221134120 is an abundant number, since it is smaller than the sum of its proper divisors (1526417740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221134120 is a wasteful number, since it uses less digits than its factorization.

1221134120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30528364 (or 30528360 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1221134120 is about 34944.7295024586. The cubic root of 1221134120 is about 1068.8607316843.

Adding to 1221134120 its reverse (214311221), we get a palindrome (1435445341).

The spelling of 1221134120 in words is "one billion, two hundred twenty-one million, one hundred thirty-four thousand, one hundred twenty".