210020111020 has 12 divisors (see below), whose sum is σ = 441042233184. Its totient is φ = 84008044400.

The previous prime is 210020110991. The next prime is 210020111023. The reversal of 210020111020 is 20111020012.

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 = 210020110988 and 210020111006.

It is not an unprimeable number, because it can be changed into a prime (210020111023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5250502756 + ... + 5250502795.

It is an arithmetic number, because the mean of its divisors is an integer number (36753519432).

Almost surely, 2^210020111020 is an apocalyptic number.

210020111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210020111020 is an abundant number, since it is smaller than the sum of its proper divisors (231022122164).

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

210020111020 is a wasteful number, since it uses less digits than its factorization.

210020111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501005560 (or 10501005558 counting only the distinct ones).

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

Adding to 210020111020 its reverse (20111020012), we get a palindrome (230131131032).

The spelling of 210020111020 in words is "two hundred ten billion, twenty million, one hundred eleven thousand, twenty".