210111000021020 has 96 divisors (see below), whose sum is σ = 508359863531520. Its totient is φ = 71454131089920.

The previous prime is 210111000020981. The next prime is 210111000021029. The reversal of 210111000021020 is 20120000111012.

It is a junction number, because it is equal to n+sod(n) for n = 210111000020992 and 210111000021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111000021029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19161071 + ... + 28060089.

It is an arithmetic number, because the mean of its divisors is an integer number (5295415245120).

Almost surely, 2^{210111000021020} is an apocalyptic number.

210111000021020 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 210111000021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254179931765760).

210111000021020 is an abundant number, since it is smaller than the sum of its proper divisors (298248863510500).

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

210111000021020 is a wasteful number, since it uses less digits than its factorization.

210111000021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8900403 (or 8900401 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210111000021020 its reverse (20120000111012), we get a palindrome (230231000132032).

The spelling of 210111000021020 in words is "two hundred ten trillion, one hundred eleven billion, twenty-one thousand, twenty".