1220111112220 has 288 divisors, whose sum is σ = 3522421667520. Its totient is φ = 351034145280.

The previous prime is 1220111112211. The next prime is 1220111112239. The reversal of 1220111112220 is 222111110221.

It is a super-2 number, since 2×1220111112220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220111112194 and 1220111112203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23657902 + ... + 23709418.

It is an arithmetic number, because the mean of its divisors is an integer number (12230630790).

Almost surely, 2^{1220111112220} is an apocalyptic number.

1220111112220 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 1220111112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1761210833760).

1220111112220 is an abundant number, since it is smaller than the sum of its proper divisors (2302310555300).

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

1220111112220 is a wasteful number, since it uses less digits than its factorization.

1220111112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51590 (or 51555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1220111112220 its reverse (222111110221), we get a palindrome (1442222222441).

It can be divided in two parts, 1220111 and 112220, that added together give a palindrome (1332331).

The spelling of 1220111112220 in words is "one trillion, two hundred twenty billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty".