1213122344 has 64 divisors (see below), whose sum is σ = 2639952000. Its totient is φ = 511893504.

The previous prime is 1213122343. The next prime is 1213122347. The reversal of 1213122344 is 4432213121.

It is not an unprimeable number, because it can be changed into a prime (1213122343) by changing a digit.

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, 1155932 + ... + 1156980.

It is an arithmetic number, because the mean of its divisors is an integer number (41249250).

Almost surely, 2^1213122344 is an apocalyptic number.

1213122344 is a gapful number since it is divisible by the number (14) 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 1213122344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1319976000).

1213122344 is an abundant number, since it is smaller than the sum of its proper divisors (1426829656).

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

1213122344 is a wasteful number, since it uses less digits than its factorization.

1213122344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362 (or 1358 counting only the distinct ones).

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

The square root of 1213122344 is about 34829.9058856035. The cubic root of 1213122344 is about 1066.5180271180.

Adding to 1213122344 its reverse (4432213121), we get a palindrome (5645335465).

The spelling of 1213122344 in words is "one billion, two hundred thirteen million, one hundred twenty-two thousand, three hundred forty-four".