43672121 has 2 divisors, whose sum is σ = 43672122. Its totient is φ = 43672120.

The previous prime is 43672117. The next prime is 43672169. The reversal of 43672121 is 12127634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31866025 + 11806096 = 5645^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 43672121 - 2² = 43672117 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (43672021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21836060 + 21836061.

It is an arithmetic number, because the mean of its divisors is an integer number (21836061).

Almost surely, 2^43672121 is an apocalyptic number.

It is an amenable number.

43672121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43672121 is an equidigital number, since it uses as much as digits as its factorization.

43672121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 43672121 is about 6608.4885563947. The cubic root of 43672121 is about 352.1557318184.

Adding to 43672121 its reverse (12127634), we get a palindrome (55799755).

The spelling of 43672121 in words is "forty-three million, six hundred seventy-two thousand, one hundred twenty-one".