1121212021200 has 240 divisors, whose sum is σ = 3690462336960. Its totient is φ = 290769039360.

The previous prime is 1121212021187. The next prime is 1121212021201. The reversal of 1121212021200 is 21202121211.

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 (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1121212021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121212021201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118054852 + ... + 118064348.

It is an arithmetic number, because the mean of its divisors is an integer number (15376926404).

Almost surely, 2^{1121212021200} is an apocalyptic number.

1121212021200 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 1121212021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1845231168480).

1121212021200 is an abundant number, since it is smaller than the sum of its proper divisors (2569250315760).

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

1121212021200 is a wasteful number, since it uses less digits than its factorization.

1121212021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12214 (or 12203 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1121212021200 its reverse (21202121211), we get a palindrome (1142414142411).

The spelling of 1121212021200 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, twenty-one thousand, two hundred".