1321243434 has 128 divisors (see below), whose sum is σ = 3649605120. Its totient is φ = 345627648.

The previous prime is 1321243433. The next prime is 1321243447. The reversal of 1321243434 is 4343421231.

1321243434 is a `hidden beast` number, since 13 + 212 + 4 + 3 + 434 = 666.

It is a super-2 number, since 2×1321243434² = 3491368423776224712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1321243398 and 1321243407.

It is not an unprimeable number, because it can be changed into a prime (1321243433) 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 63 ways as a sum of consecutive naturals, for example, 234984 + ... + 240540.

It is an arithmetic number, because the mean of its divisors is an integer number (28512540).

Almost surely, 2^1321243434 is an apocalyptic number.

1321243434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321243434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1824802560).

1321243434 is an abundant number, since it is smaller than the sum of its proper divisors (2328361686).

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

1321243434 is a wasteful number, since it uses less digits than its factorization.

1321243434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629 (or 5623 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 1321243434 is about 36348.9124183929. The cubic root of 1321243434 is about 1097.3056465776.

Adding to 1321243434 its reverse (4343421231), we get a palindrome (5664664665).

The spelling of 1321243434 in words is "one billion, three hundred twenty-one million, two hundred forty-three thousand, four hundred thirty-four".