1321110220 has 12 divisors (see below), whose sum is σ = 2774331504. Its totient is φ = 528444080.

The previous prime is 1321110191. The next prime is 1321110257. The reversal of 1321110220 is 220111231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321110220.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 33027736 + ... + 33027775.

It is an arithmetic number, because the mean of its divisors is an integer number (231194292).

Almost surely, 2^1321110220 is an apocalyptic number.

1321110220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321110220 is an abundant number, since it is smaller than the sum of its proper divisors (1453221284).

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

1321110220 is a wasteful number, since it uses less digits than its factorization.

1321110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66055520 (or 66055518 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1321110220 is about 36347.0799377337. The cubic root of 1321110220 is about 1097.2687668264.

Adding to 1321110220 its reverse (220111231), we get a palindrome (1541221451).

The spelling of 1321110220 in words is "one billion, three hundred twenty-one million, one hundred ten thousand, two hundred twenty".