43240203121 has 2 divisors, whose sum is σ = 43240203122. Its totient is φ = 43240203120.

The previous prime is 43240203119. The next prime is 43240203179. The reversal of 43240203121 is 12130204234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35933372721 + 7306830400 = 189561^2 + 85480^2 .

It is a cyclic number.

It is not a de Polignac number, because 43240203121 - 2¹ = 43240203119 is a prime.

Together with 43240203119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 43240203092 and 43240203101.

It is not a weakly prime, because it can be changed into another prime (43240203101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21620101560 + 21620101561.

It is an arithmetic number, because the mean of its divisors is an integer number (21620101561).

Almost surely, 2^43240203121 is an apocalyptic number.

It is an amenable number.

43240203121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43240203121 is an equidigital number, since it uses as much as digits as its factorization.

43240203121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 43240203121 its reverse (12130204234), we get a palindrome (55370407355).

The spelling of 43240203121 in words is "forty-three billion, two hundred forty million, two hundred three thousand, one hundred twenty-one".