43240222121 has 4 divisors (see below), whose sum is σ = 43246728132. Its totient is φ = 43233716112.

The previous prime is 43240222079. The next prime is 43240222141. The reversal of 43240222121 is 12122204234.

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 1843843600 + 41396378521 = 42940^2 + 203461^2 .

It is a cyclic number.

It is not a de Polignac number, because 43240222121 - 2¹⁸ = 43239959977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43240222141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3243026 + ... + 3256331.

It is an arithmetic number, because the mean of its divisors is an integer number (10811682033).

Almost surely, 2^43240222121 is an apocalyptic number.

It is an amenable number.

43240222121 is a deficient number, since it is larger than the sum of its proper divisors (6506011).

43240222121 is an equidigital number, since it uses as much as digits as its factorization.

43240222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6506010.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 43240222121 its reverse (12122204234), we get a palindrome (55362426355).

The spelling of 43240222121 in words is "forty-three billion, two hundred forty million, two hundred twenty-two thousand, one hundred twenty-one".