2211131311220 has 96 divisors (see below), whose sum is σ = 5051788076160. Its totient is φ = 808059225600.

The previous prime is 2211131311199. The next prime is 2211131311237. The reversal of 2211131311220 is 221131311122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2211131311192 and 2211131311201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87249311 + ... + 87274649.

It is an arithmetic number, because the mean of its divisors is an integer number (52622792460).

Almost surely, 2^{2211131311220} is an apocalyptic number.

2211131311220 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 2211131311220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2525894038080).

2211131311220 is an abundant number, since it is smaller than the sum of its proper divisors (2840656764940).

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

2211131311220 is a wasteful number, since it uses less digits than its factorization.

2211131311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28785 (or 28783 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2211131311220 its reverse (221131311122), we get a palindrome (2432262622342).

The spelling of 2211131311220 in words is "two trillion, two hundred eleven billion, one hundred thirty-one million, three hundred eleven thousand, two hundred twenty".