1331122212 has 144 divisors (see below), whose sum is σ = 3970337280. Its totient is φ = 368084736.

The previous prime is 1331122201. The next prime is 1331122283. The reversal of 1331122212 is 2122211331.

1331122212 is a `hidden beast` number, since 1 + 331 + 122 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3421714 + ... + 3422102.

Almost surely, 2^1331122212 is an apocalyptic number.

1331122212 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 1331122212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1985168640).

1331122212 is an abundant number, since it is smaller than the sum of its proper divisors (2639215068).

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

1331122212 is a wasteful number, since it uses less digits than its factorization.

1331122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 805 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1331122212 is about 36484.5475783927. The cubic root of 1331122212 is about 1100.0336661872.

Adding to 1331122212 its reverse (2122211331), we get a palindrome (3453333543).

The spelling of 1331122212 in words is "one billion, three hundred thirty-one million, one hundred twenty-two thousand, two hundred twelve".