20001122121000 has 128 divisors (see below), whose sum is σ = 62542488528000. Its totient is φ = 5321753292800.

The previous prime is 20001122120999. The next prime is 20001122121061. The reversal of 20001122121000 is 12122110002.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 31 ways as a sum of consecutive naturals, for example, 6077322 + ... + 8771321.

It is an arithmetic number, because the mean of its divisors is an integer number (488613191625).

Almost surely, 2^{20001122121000} is an apocalyptic number.

20001122121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001122121000 is an abundant number, since it is smaller than the sum of its proper divisors (42541366407000).

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

20001122121000 is a wasteful number, since it uses less digits than its factorization.

20001122121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14849116 (or 14849102 counting only the distinct ones).

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

Adding to 20001122121000 its reverse (12122110002), we get a palindrome (20013244231002).

The spelling of 20001122121000 in words is "twenty trillion, one billion, one hundred twenty-two million, one hundred twenty-one thousand".