201021100120 has 32 divisors (see below), whose sum is σ = 453841179120. Its totient is φ = 80134003840.

The previous prime is 201021100097. The next prime is 201021100123. The reversal of 201021100120 is 21001120102.

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

It is a junction number, because it is equal to n+sod(n) for n = 201021100097 and 201021100106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021100123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8564266 + ... + 8587705.

Almost surely, 2^201021100120 is an apocalyptic number.

201021100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021100120 is an abundant number, since it is smaller than the sum of its proper divisors (252820079000).

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

201021100120 is a wasteful number, since it uses less digits than its factorization.

201021100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17152275 (or 17152271 counting only the distinct ones).

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

Adding to 201021100120 its reverse (21001120102), we get a palindrome (222022220222).

The spelling of 201021100120 in words is "two hundred one billion, twenty-one million, one hundred thousand, one hundred twenty".