2121111111020 has 96 divisors (see below), whose sum is σ = 4952903155200. Its totient is φ = 756510796800.

The previous prime is 2121111111019. The next prime is 2121111111029. The reversal of 2121111111020 is 201111111212.

It is a super-2 number, since 2×2121111111020² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121111110986 and 2121111111004.

It is not an unprimeable number, because it can be changed into a prime (2121111111029) 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, 5512100 + ... + 5884340.

It is an arithmetic number, because the mean of its divisors is an integer number (51592741200).

Almost surely, 2^{2121111111020} is an apocalyptic number.

2121111111020 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 2121111111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2476451577600).

2121111111020 is an abundant number, since it is smaller than the sum of its proper divisors (2831792044180).

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

2121111111020 is a wasteful number, since it uses less digits than its factorization.

2121111111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372759 (or 372757 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 2121111111020 its reverse (201111111212), we get a palindrome (2322222222232).

The spelling of 2121111111020 in words is "two trillion, one hundred twenty-one billion, one hundred eleven million, one hundred eleven thousand, twenty".