43121324221 has 4 divisors (see below), whose sum is σ = 43148059452. Its totient is φ = 43094588992.

The previous prime is 43121324203. The next prime is 43121324227. The reversal of 43121324221 is 12242312134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36699064900 + 6422259321 = 191570^2 + 80139^2 .

It is a cyclic number.

It is not a de Polignac number, because 43121324221 - 2⁹ = 43121323709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43121324227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13365196 + ... + 13368421.

It is an arithmetic number, because the mean of its divisors is an integer number (10787014863).

Almost surely, 2^43121324221 is an apocalyptic number.

It is an amenable number.

43121324221 is a deficient number, since it is larger than the sum of its proper divisors (26735231).

43121324221 is a wasteful number, since it uses less digits than its factorization.

43121324221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26735230.

The product of its digits is 2304, while the sum is 25.

Adding to 43121324221 its reverse (12242312134), we get a palindrome (55363636355).

The spelling of 43121324221 in words is "forty-three billion, one hundred twenty-one million, three hundred twenty-four thousand, two hundred twenty-one".