20201221011120 has 160 divisors (see below), whose sum is σ = 66903652058880. Its totient is φ = 5027295144960.

The previous prime is 20201221011109. The next prime is 20201221011143. The reversal of 20201221011120 is 2111012210202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20201221011120.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32754871 + ... + 33365910.

It is an arithmetic number, because the mean of its divisors is an integer number (418147825368).

Almost surely, 2^{20201221011120} is an apocalyptic number.

20201221011120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201221011120 is an abundant number, since it is smaller than the sum of its proper divisors (46702431047760).

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

20201221011120 is a wasteful number, since it uses less digits than its factorization.

20201221011120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66120883 (or 66120877 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20201221011120 its reverse (2111012210202), we get a palindrome (22312233221322).

The spelling of 20201221011120 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, eleven thousand, one hundred twenty".