1221194200 has 96 divisors (see below), whose sum is σ = 3019226400. Its totient is φ = 458332160.

The previous prime is 1221194173. The next prime is 1221194231. The reversal of 1221194200 is 24911221.

It is a super-2 number, since 2×1221194200² = 2982630548227280000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241296 + ... + 246304.

It is an arithmetic number, because the mean of its divisors is an integer number (31450275).

Almost surely, 2^1221194200 is an apocalyptic number.

1221194200 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 1221194200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509613200).

1221194200 is an abundant number, since it is smaller than the sum of its proper divisors (1798032200).

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

1221194200 is a wasteful number, since it uses less digits than its factorization.

1221194200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101 (or 5092 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1221194200 is about 34945.5891351112. The cubic root of 1221194200 is about 1068.8782607715.

The spelling of 1221194200 in words is "one billion, two hundred twenty-one million, one hundred ninety-four thousand, two hundred".