43123321320 has 128 divisors (see below), whose sum is σ = 141703603200. Its totient is φ = 10449883136.

The previous prime is 43123321313. The next prime is 43123321321. The reversal of 43123321320 is 2312332134.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (43123321321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305304 + ... + 423623.

It is an arithmetic number, because the mean of its divisors is an integer number (1107059400).

Almost surely, 2^43123321320 is an apocalyptic number.

43123321320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43123321320 is an abundant number, since it is smaller than the sum of its proper divisors (98580281880).

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

43123321320 is a wasteful number, since it uses less digits than its factorization.

43123321320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728987 (or 728983 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 43123321320 its reverse (2312332134), we get a palindrome (45435653454).

The spelling of 43123321320 in words is "forty-three billion, one hundred twenty-three million, three hundred twenty-one thousand, three hundred twenty".