43243321221 has 24 divisors (see below), whose sum is σ = 62920376064. Its totient is φ = 28618362720.

The previous prime is 43243321189. The next prime is 43243321241. The reversal of 43243321221 is 12212334234.

43243321221 is a `hidden beast` number, since 4 + 3 + 2 + 433 + 2 + 1 + 221 = 666.

It is not a de Polignac number, because 43243321221 - 2⁵ = 43243321189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43243321241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 643600 + ... + 707606.

It is an arithmetic number, because the mean of its divisors is an integer number (2621682336).

Almost surely, 2^43243321221 is an apocalyptic number.

It is an amenable number.

43243321221 is a deficient number, since it is larger than the sum of its proper divisors (19677054843).

43243321221 is a wasteful number, since it uses less digits than its factorization.

43243321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64561 (or 64558 counting only the distinct ones).

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

Adding to 43243321221 its reverse (12212334234), we get a palindrome (55455655455).

The spelling of 43243321221 in words is "forty-three billion, two hundred forty-three million, three hundred twenty-one thousand, two hundred twenty-one".