1222111112220 has 144 divisors (see below), whose sum is σ = 3814310162208. Its totient is φ = 316501240320.

The previous prime is 1222111112197. The next prime is 1222111112267. The reversal of 1222111112220 is 222111112221.

1222111112220 is a `hidden beast` number, since 1 + 222 + 111 + 112 + 220 = 666.

It is a super-2 number, since 2×1222111112220² (a number of 25 digits) contains 22 as substring.

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 = 1222111112193 and 1222111112202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3433467 + ... + 3772653.

Almost surely, 2^{1222111112220} is an apocalyptic number.

1222111112220 is a gapful number since it is divisible by the number (10) 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 1222111112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1907155081104).

1222111112220 is an abundant number, since it is smaller than the sum of its proper divisors (2592199049988).

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

1222111112220 is a wasteful number, since it uses less digits than its factorization.

1222111112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339780 (or 339775 counting only the distinct ones).

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

Adding to 1222111112220 its reverse (222111112221), we get a palindrome (1444222224441).

Subtracting from 1222111112220 its reverse (222111112221), we obtain a palindrome (999999999999).

It can be divided in two parts, 1222111 and 112220, that added together give a palindrome (1334331).

The spelling of 1222111112220 in words is "one trillion, two hundred twenty-two billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty".