1221043411200 has 864 divisors, whose sum is σ = 4237962753024. Its totient is φ = 309358264320.

The previous prime is 1221043411109. The next prime is 1221043411201. The reversal of 1221043411200 is 21143401221.

It is not an unprimeable number, because it can be changed into a prime (1221043411201) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 7058054314 + ... + 7058054486.

Almost surely, 2^{1221043411200} is an apocalyptic number.

1221043411200 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 1221043411200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2118981376512).

1221043411200 is an abundant number, since it is smaller than the sum of its proper divisors (3016919341824).

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

1221043411200 is a wasteful number, since it uses less digits than its factorization.

1221043411200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1221043411200 its reverse (21143401221), we get a palindrome (1242186812421).

The spelling of 1221043411200 in words is "one trillion, two hundred twenty-one billion, forty-three million, four hundred eleven thousand, two hundred".