1221003232200 has 144 divisors (see below), whose sum is σ = 4125090977280. Its totient is φ = 323651076480.

The previous prime is 1221003232177. The next prime is 1221003232217. The reversal of 1221003232200 is 22323001221.

1221003232200 is a `hidden beast` number, since 1 + 22 + 100 + 323 + 220 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1730344 + ... + 2331543.

It is an arithmetic number, because the mean of its divisors is an integer number (28646465120).

Almost surely, 2^{1221003232200} is an apocalyptic number.

1221003232200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221003232200 is an abundant number, since it is smaller than the sum of its proper divisors (2904087745080).

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

1221003232200 is a wasteful number, since it uses less digits than its factorization.

1221003232200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4062076 (or 4062064 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 1221003232200 its reverse (22323001221), we get a palindrome (1243326233421).

The spelling of 1221003232200 in words is "one trillion, two hundred twenty-one billion, three million, two hundred thirty-two thousand, two hundred".