20001121122200 has 192 divisors, whose sum is σ = 51440259621600. Its totient is φ = 7198198784000.

The previous prime is 20001121122173. The next prime is 20001121122211. The reversal of 20001121122200 is 222112110002.

It is a super-2 number, since 2×20001121122200² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8954387 + ... + 10962813.

Almost surely, 2^{20001121122200} is an apocalyptic number.

20001121122200 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 20001121122200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25720129810800).

20001121122200 is an abundant number, since it is smaller than the sum of its proper divisors (31439138499400).

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

20001121122200 is a wasteful number, since it uses less digits than its factorization.

20001121122200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008590 (or 2008581 counting only the distinct ones).

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

Adding to 20001121122200 its reverse (222112110002), we get a palindrome (20223233232202).

The spelling of 20001121122200 in words is "twenty trillion, one billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred".