1221190357800 has 288 divisors, whose sum is σ = 4437392461920. Its totient is φ = 276997593600.

The previous prime is 1221190357799. The next prime is 1221190357841. The reversal of 1221190357800 is 87530911221.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3692862 + ... + 4009938.

It is an arithmetic number, because the mean of its divisors is an integer number (15407612715).

Almost surely, 2^{1221190357800} is an apocalyptic number.

1221190357800 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 1221190357800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2218696230960).

1221190357800 is an abundant number, since it is smaller than the sum of its proper divisors (3216202104120).

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

1221190357800 is a wasteful number, since it uses less digits than its factorization.

1221190357800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317241 (or 317225 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 1221190357800 in words is "one trillion, two hundred twenty-one billion, one hundred ninety million, three hundred fifty-seven thousand, eight hundred".