1220111420 has 96 divisors (see below), whose sum is σ = 2982147840. Its totient is φ = 414397440.

The previous prime is 1220111419. The next prime is 1220111443. The reversal of 1220111420 is 241110221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1220111395 and 1220111404.

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, 518687 + ... + 521033.

It is an arithmetic number, because the mean of its divisors is an integer number (31064040).

Almost surely, 2^1220111420 is an apocalyptic number.

1220111420 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 1220111420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1491073920).

1220111420 is an abundant number, since it is smaller than the sum of its proper divisors (1762036420).

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

1220111420 is a wasteful number, since it uses less digits than its factorization.

1220111420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523 (or 2521 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1220111420 is about 34930.0933293915. The cubic root of 1220111420 is about 1068.5622580063.

Adding to 1220111420 its reverse (241110221), we get a palindrome (1461221641).

The spelling of 1220111420 in words is "one billion, two hundred twenty million, one hundred eleven thousand, four hundred twenty".