1331221110 has 16 divisors (see below), whose sum is σ = 3194930736. Its totient is φ = 354992288.

The previous prime is 1331221109. The next prime is 1331221121. The reversal of 1331221110 is 111221331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331221110.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 22186989 + ... + 22187048.

It is an arithmetic number, because the mean of its divisors is an integer number (199683171).

Almost surely, 2^1331221110 is an apocalyptic number.

1331221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1331221110 is an abundant number, since it is smaller than the sum of its proper divisors (1863709626).

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

1331221110 is a wasteful number, since it uses less digits than its factorization.

1331221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44374047.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1331221110 is about 36485.9028941316. The cubic root of 1331221110 is about 1100.0609084731.

Adding to 1331221110 its reverse (111221331), we get a palindrome (1442442441).

It can be divided in two parts, 1331221 and 110, that added together give a palindrome (1331331).

The spelling of 1331221110 in words is "one billion, three hundred thirty-one million, two hundred twenty-one thousand, one hundred ten".