1212321344 has 56 divisors (see below), whose sum is σ = 2607536568. Its totient is φ = 555909120.

The previous prime is 1212321263. The next prime is 1212321347. The reversal of 1212321344 is 4431232121.

It can be written as a sum of positive squares in 4 ways, for example, as 117505600 + 1094815744 = 10840^2 + 33088^2 .

It is a super-2 number, since 2×1212321344² = 2939446082235932672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212321347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125984 + ... + 135264.

It is an arithmetic number, because the mean of its divisors is an integer number (46563153).

Almost surely, 2^1212321344 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 1212321344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1303768284).

1212321344 is an abundant number, since it is smaller than the sum of its proper divisors (1395215224).

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

1212321344 is a wasteful number, since it uses less digits than its factorization.

1212321344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9463 (or 9453 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 1212321344 is about 34818.4052477996. The cubic root of 1212321344 is about 1066.2832420516.

Adding to 1212321344 its reverse (4431232121), we get a palindrome (5643553465).

The spelling of 1212321344 in words is "one billion, two hundred twelve million, three hundred twenty-one thousand, three hundred forty-four".