1221001201200 has 240 divisors, whose sum is σ = 4276002496896. Its totient is φ = 295364966400.

The previous prime is 1221001201187. The next prime is 1221001201229. The reversal of 1221001201200 is 21021001221.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6065364 + ... + 6263436.

Almost surely, 2^{1221001201200} is an apocalyptic number.

1221001201200 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 1221001201200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2138001248448).

1221001201200 is an abundant number, since it is smaller than the sum of its proper divisors (3055001295696).

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

1221001201200 is a wasteful number, since it uses less digits than its factorization.

1221001201200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198572 (or 198561 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221001201200 its reverse (21021001221), we get a palindrome (1242022202421).

The spelling of 1221001201200 in words is "one trillion, two hundred twenty-one billion, one million, two hundred one thousand, two hundred".