201121100020 has 48 divisors (see below), whose sum is σ = 440295399936. Its totient is φ = 77082480000.

The previous prime is 201121100009. The next prime is 201121100039. The reversal of 201121100020 is 20001121102.

201121100020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1543266 + ... + 1668505.

It is an arithmetic number, because the mean of its divisors is an integer number (9172820832).

Almost surely, 2^201121100020 is an apocalyptic number.

201121100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121100020 is an abundant number, since it is smaller than the sum of its proper divisors (239174299916).

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

201121100020 is a wasteful number, since it uses less digits than its factorization.

201121100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211912 (or 3211910 counting only the distinct ones).

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

Adding to 201121100020 its reverse (20001121102), we get a palindrome (221122221122).

The spelling of 201121100020 in words is "two hundred one billion, one hundred twenty-one million, one hundred thousand, twenty".