43140121 has 2 divisors, whose sum is σ = 43140122. Its totient is φ = 43140120.

The previous prime is 43140109. The next prime is 43140193. The reversal of 43140121 is 12104134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29160000 + 13980121 = 5400^2 + 3739^2 .

It is a cyclic number.

It is not a de Polignac number, because 43140121 - 2¹³ = 43131929 is a prime.

It is a super-2 number, since 2×43140121² = 3722140079789282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43140095 and 43140104.

It is not a weakly prime, because it can be changed into another prime (43140421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21570060 + 21570061.

It is an arithmetic number, because the mean of its divisors is an integer number (21570061).

Almost surely, 2^43140121 is an apocalyptic number.

It is an amenable number.

43140121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43140121 is an equidigital number, since it uses as much as digits as its factorization.

43140121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 43140121 is about 6568.1139606435. The cubic root of 43140121 is about 350.7199357930.

Adding to 43140121 its reverse (12104134), we get a palindrome (55244255).

The spelling of 43140121 in words is "forty-three million, one hundred forty thousand, one hundred twenty-one".