2211111111220 has 96 divisors (see below), whose sum is σ = 5224452742656. Its totient is φ = 779141376000.

The previous prime is 2211111111203. The next prime is 2211111111227. The reversal of 2211111111220 is 221111111122.

It is a junction number, because it is equal to n+sod(n) for n = 2211111111194 and 2211111111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211111111227) 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, 14277 + ... + 2102956.

It is an arithmetic number, because the mean of its divisors is an integer number (54421382736).

Almost surely, 2^{2211111111220} is an apocalyptic number.

2211111111220 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 2211111111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2612226371328).

2211111111220 is an abundant number, since it is smaller than the sum of its proper divisors (3013341631436).

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

2211111111220 is a wasteful number, since it uses less digits than its factorization.

2211111111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117401 (or 2117399 counting only the distinct ones).

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

Adding to 2211111111220 its reverse (221111111122), we get a palindrome (2432222222342).

It can be divided in two parts, 221111 and 1111220, that added together give a palindrome (1332331).

The spelling of 2211111111220 in words is "two trillion, two hundred eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty".