2111212100020 has 120 divisors (see below), whose sum is σ = 4723008998400. Its totient is φ = 792723319296.

The previous prime is 2111212100017. The next prime is 2111212100033. The reversal of 2111212100020 is 200012121112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 733312941 + ... + 733315819.

It is an arithmetic number, because the mean of its divisors is an integer number (39358408320).

Almost surely, 2^{2111212100020} is an apocalyptic number.

2111212100020 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 2111212100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2361504499200).

2111212100020 is an abundant number, since it is smaller than the sum of its proper divisors (2611796898380).

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

2111212100020 is an equidigital number, since it uses as much as digits as its factorization.

2111212100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3395 (or 3342 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2111212100020 its reverse (200012121112), we get a palindrome (2311224221132).

The spelling of 2111212100020 in words is "two trillion, one hundred eleven billion, two hundred twelve million, one hundred thousand, twenty".