1221134200 has 96 divisors (see below), whose sum is σ = 3335567760. Its totient is φ = 409881600.

The previous prime is 1221134197. The next prime is 1221134207. The reversal of 1221134200 is 24311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221134207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7252 + ... + 49948.

Almost surely, 2^1221134200 is an apocalyptic number.

1221134200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221134200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1667783880).

1221134200 is an abundant number, since it is smaller than the sum of its proper divisors (2114433560).

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

1221134200 is a wasteful number, since it uses less digits than its factorization.

1221134200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42737 (or 42728 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221134200 is about 34944.7306471233. The cubic root of 1221134200 is about 1068.8607550257.

Adding to 1221134200 its reverse (24311221), we get a palindrome (1245445421).

The spelling of 1221134200 in words is "one billion, two hundred twenty-one million, one hundred thirty-four thousand, two hundred".