2001120121200 has 240 divisors, whose sum is σ = 6673700725856. Its totient is φ = 512096256000.

The previous prime is 2001120121199. The next prime is 2001120121211. The reversal of 2001120121200 is 21210211002.

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 a congruent number.

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, 2932500 + ... + 3549900.

Almost surely, 2^{2001120121200} is an apocalyptic number.

2001120121200 is a gapful number since it is divisible by the number (20) 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 2001120121200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3336850362928).

2001120121200 is an abundant number, since it is smaller than the sum of its proper divisors (4672580604656).

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

2001120121200 is a wasteful number, since it uses less digits than its factorization.

2001120121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617532 (or 617521 counting only the distinct ones).

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

Adding to 2001120121200 its reverse (21210211002), we get a palindrome (2022330332202).

The spelling of 2001120121200 in words is "two trillion, one billion, one hundred twenty million, one hundred twenty-one thousand, two hundred".