1220213112 has 64 divisors (see below), whose sum is σ = 3230772480. Its totient is φ = 383235072.

The previous prime is 1220213053. The next prime is 1220213119. The reversal of 1220213112 is 2113120221.

It is a junction number, because it is equal to n+sod(n) for n = 1220213091 and 1220213100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220213119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20488 + ... + 53480.

It is an arithmetic number, because the mean of its divisors is an integer number (50480820).

Almost surely, 2^1220213112 is an apocalyptic number.

1220213112 is a gapful number since it is divisible by the number (12) 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 1220213112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1615386240).

1220213112 is an abundant number, since it is smaller than the sum of its proper divisors (2010559368).

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

1220213112 is a wasteful number, since it uses less digits than its factorization.

1220213112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33092 (or 33088 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1220213112 is about 34931.5489493380. The cubic root of 1220213112 is about 1068.5919441516.

Adding to 1220213112 its reverse (2113120221), we get a palindrome (3333333333).

The spelling of 1220213112 in words is "one billion, two hundred twenty million, two hundred thirteen thousand, one hundred twelve".