1321243112 has 64 divisors (see below), whose sum is σ = 2907991680. Its totient is φ = 550996992.

The previous prime is 1321243093. The next prime is 1321243127. The reversal of 1321243112 is 2113421231.

It is a super-2 number, since 2×1321243112² = 3491366722014889088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 752828 + ... + 754580.

It is an arithmetic number, because the mean of its divisors is an integer number (45437370).

Almost surely, 2^1321243112 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 1321243112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1453995840).

1321243112 is an abundant number, since it is smaller than the sum of its proper divisors (1586748568).

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

1321243112 is a wasteful number, since it uses less digits than its factorization.

1321243112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122 (or 2118 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 1321243112 is about 36348.9079890992. The cubic root of 1321243112 is about 1097.3055574362.

Adding to 1321243112 its reverse (2113421231), we get a palindrome (3434664343).

The spelling of 1321243112 in words is "one billion, three hundred twenty-one million, two hundred forty-three thousand, one hundred twelve".