1211130121200 has 120 divisors (see below), whose sum is σ = 3880826873088. Its totient is φ = 322870352640.

The previous prime is 1211130121199. The next prime is 1211130121217. The reversal of 1211130121200 is 21210311121.

It is a tau number, because it is divible by the number of its divisors (120).

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 1211130121200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3860647 + ... + 4162553.

Almost surely, 2^{1211130121200} is an apocalyptic number.

1211130121200 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 1211130121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1940413436544).

1211130121200 is an abundant number, since it is smaller than the sum of its proper divisors (2669696751888).

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

1211130121200 is a wasteful number, since it uses less digits than its factorization.

1211130121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305271 (or 305260 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 1211130121200 its reverse (21210311121), we get a palindrome (1232340432321).

The spelling of 1211130121200 in words is "one trillion, two hundred eleven billion, one hundred thirty million, one hundred twenty-one thousand, two hundred".