1220221110 has 64 divisors (see below), whose sum is σ = 3039871680. Its totient is φ = 313098240.

The previous prime is 1220221099. The next prime is 1220221111. The reversal of 1220221110 is 111220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 270070 + ... + 274550.

It is an arithmetic number, because the mean of its divisors is an integer number (47497995).

Almost surely, 2^1220221110 is an apocalyptic number.

1220221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220221110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1519935840).

1220221110 is an abundant number, since it is smaller than the sum of its proper divisors (1819650570).

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

1220221110 is a wasteful number, since it uses less digits than its factorization.

1220221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4833.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1220221110 is about 34931.6634301889. The cubic root of 1220221110 is about 1068.5942788748.

Adding to 1220221110 its reverse (111220221), we get a palindrome (1331441331).

The spelling of 1220221110 in words is "one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred ten".