20201121100 has 72 divisors (see below), whose sum is σ = 46600923600. Its totient is φ = 7579296000.

The previous prime is 20201121091. The next prime is 20201121103. The reversal of 20201121100 is 112110202.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20201121103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139266 + ... + 244534.

It is an arithmetic number, because the mean of its divisors is an integer number (647235050).

Almost surely, 2^20201121100 is an apocalyptic number.

20201121100 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 20201121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23300461800).

20201121100 is an abundant number, since it is smaller than the sum of its proper divisors (26399802500).

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

20201121100 is a wasteful number, since it uses less digits than its factorization.

20201121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105403 (or 105396 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20201121100 its reverse (112110202), we get a palindrome (20313231302).

The spelling of 20201121100 in words is "twenty billion, two hundred one million, one hundred twenty-one thousand, one hundred".