201021120020 has 48 divisors (see below), whose sum is σ = 482525355648. Its totient is φ = 68910860160.

The previous prime is 201021119989. The next prime is 201021120061. The reversal of 201021120020 is 20021120102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 201021119983 and 201021120010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 824759 + ... + 1040321.

It is an arithmetic number, because the mean of its divisors is an integer number (10052611576).

Almost surely, 2^201021120020 is an apocalyptic number.

201021120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021120020 is an abundant number, since it is smaller than the sum of its proper divisors (281504235628).

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

201021120020 is a wasteful number, since it uses less digits than its factorization.

201021120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222240 (or 222238 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201021120020 its reverse (20021120102), we get a palindrome (221042240122).

The spelling of 201021120020 in words is "two hundred one billion, twenty-one million, one hundred twenty thousand, twenty".