43530232321 has 27 divisors (see below), whose sum is σ = 46867945761. Its totient is φ = 40424223528.

The previous prime is 43530232309. The next prime is 43530232399. The reversal of 43530232321 is 12323203534.

The square root of 43530232321 is 208639.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 43530232321 - 2⁹ = 43530231809 is a prime.

It is a super-2 number, since 2×43530232321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43530232321.

It is not an unprimeable number, because it can be changed into a prime (43530232721) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 313167070 + ... + 313167208.

It is an arithmetic number, because the mean of its divisors is an integer number (1735849843).

Almost surely, 2^43530232321 is an apocalyptic number.

43530232321 is the 208639-th square number.

43530232321 is the 104320-th centered octagonal number.

It is an amenable number.

43530232321 is a deficient number, since it is larger than the sum of its proper divisors (3337713440).

43530232321 is an frugal number, since it uses more digits than its factorization.

43530232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 28.

Adding to 43530232321 its reverse (12323203534), we get a palindrome (55853435855).

The spelling of 43530232321 in words is "forty-three billion, five hundred thirty million, two hundred thirty-two thousand, three hundred twenty-one".