2211211211220 has 216 divisors, whose sum is σ = 7543988900448. Its totient is φ = 523584673920.

The previous prime is 2211211211213. The next prime is 2211211211281. The reversal of 2211211211220 is 221121121122.

2211211211220 is a `hidden beast` number, since 2 + 21 + 1 + 211 + 211 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2211211211193 and 2211211211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 243982 + ... + 2117061.

Almost surely, 2^{2211211211220} is an apocalyptic number.

2211211211220 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 2211211211220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3771994450224).

2211211211220 is an abundant number, since it is smaller than the sum of its proper divisors (5332777689228).

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

2211211211220 is a wasteful number, since it uses less digits than its factorization.

2211211211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361123 (or 2361107 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2211211211220 its reverse (221121121122), we get a palindrome (2432332332342).

It can be divided in two parts, 221121 and 1211220, that added together give a palindrome (1432341).

The spelling of 2211211211220 in words is "two trillion, two hundred eleven billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty".