2001121221200 has 60 divisors (see below), whose sum is σ = 4807876511328. Its totient is φ = 800418057600.

The previous prime is 2001121221193. The next prime is 2001121221259. The reversal of 2001121221200 is 21221211002.

It is a super-2 number, since 2×2001121221200² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12533069 + ... + 12691731.

Almost surely, 2^{2001121221200} is an apocalyptic number.

2001121221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001121221200 is an abundant number, since it is smaller than the sum of its proper divisors (2806755290128).

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

2001121221200 is a wasteful number, since it uses less digits than its factorization.

2001121221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190212 (or 190201 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001121221200 its reverse (21221211002), we get a palindrome (2022342432202).

The spelling of 2001121221200 in words is "two trillion, one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred".