43236121 has 2 divisors, whose sum is σ = 43236122. Its totient is φ = 43236120.

The previous prime is 43236119. The next prime is 43236131. The reversal of 43236121 is 12163234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21752896 + 21483225 = 4664^2 + 4635^2 .

It is a cyclic number.

It is not a de Polignac number, because 43236121 - 2¹ = 43236119 is a prime.

Together with 43236119, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 43236092 and 43236101.

It is not a weakly prime, because it can be changed into another prime (43236131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21618060 + 21618061.

It is an arithmetic number, because the mean of its divisors is an integer number (21618061).

Almost surely, 2^43236121 is an apocalyptic number.

It is an amenable number.

43236121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43236121 is an equidigital number, since it uses as much as digits as its factorization.

43236121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 22.

The square root of 43236121 is about 6575.4179334853. The cubic root of 43236121 is about 350.9798961979.

Adding to 43236121 its reverse (12163234), we get a palindrome (55399355).

The spelling of 43236121 in words is "forty-three million, two hundred thirty-six thousand, one hundred twenty-one".