20031121221200 has 120 divisors (see below), whose sum is σ = 49401291591168. Its totient is φ = 7801106826240.

The previous prime is 20031121221197. The next prime is 20031121221211. The reversal of 20031121221200 is 212212113002.

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, 3523217 + ... + 7243983.

Almost surely, 2^{20031121221200} is an apocalyptic number.

20031121221200 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 20031121221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24700645795584).

20031121221200 is an abundant number, since it is smaller than the sum of its proper divisors (29370170369968).

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

20031121221200 is a wasteful number, since it uses less digits than its factorization.

20031121221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3721141 (or 3721130 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20031121221200 its reverse (212212113002), we get a palindrome (20243333334202).

The spelling of 20031121221200 in words is "twenty trillion, thirty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred".