1331221112 has 48 divisors (see below), whose sum is σ = 2724445440. Its totient is φ = 609493248.

The previous prime is 1331221109. The next prime is 1331221121. The reversal of 1331221112 is 2111221331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167828 + ... + 175580.

It is an arithmetic number, because the mean of its divisors is an integer number (56759280).

Almost surely, 2^1331221112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331221112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1362222720).

1331221112 is an abundant number, since it is smaller than the sum of its proper divisors (1393224328).

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

1331221112 is a wasteful number, since it uses less digits than its factorization.

1331221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7912 (or 7895 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 1331221112 is about 36485.9029215394. The cubic root of 1331221112 is about 1100.0609090240.

Adding to 1331221112 its reverse (2111221331), we get a palindrome (3442442443).

The spelling of 1331221112 in words is "one billion, three hundred thirty-one million, two hundred twenty-one thousand, one hundred twelve".