1321212112 has 40 divisors (see below), whose sum is σ = 2851996032. Its totient is φ = 587769600.

The previous prime is 1321212089. The next prime is 1321212119. The reversal of 1321212112 is 2112121231.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321212119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71589 + ... + 88132.

Almost surely, 2^1321212112 is an apocalyptic number.

It is an amenable number.

1321212112 is an abundant number, since it is smaller than the sum of its proper divisors (1530783920).

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

1321212112 is a wasteful number, since it uses less digits than its factorization.

1321212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159787 (or 159781 counting only the distinct ones).

The product of its digits is 48, while the sum is 16.

The square root of 1321212112 is about 36348.4815638838. The cubic root of 1321212112 is about 1097.2969754329.

Adding to 1321212112 its reverse (2112121231), we get a palindrome (3433333343).

The spelling of 1321212112 in words is "one billion, three hundred twenty-one million, two hundred twelve thousand, one hundred twelve".