43021002161 has 2 divisors, whose sum is σ = 43021002162. Its totient is φ = 43021002160.

The previous prime is 43021002151. The next prime is 43021002169. The reversal of 43021002161 is 16120012034.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42459075136 + 561927025 = 206056^2 + 23705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43021002161 is a prime.

It is not a weakly prime, because it can be changed into another prime (43021002169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21510501080 + 21510501081.

It is an arithmetic number, because the mean of its divisors is an integer number (21510501081).

Almost surely, 2^43021002161 is an apocalyptic number.

It is an amenable number.

43021002161 is a deficient number, since it is larger than the sum of its proper divisors (1).

43021002161 is an equidigital number, since it uses as much as digits as its factorization.

43021002161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 43021002161 its reverse (16120012034), we get a palindrome (59141014195).

The spelling of 43021002161 in words is "forty-three billion, twenty-one million, two thousand, one hundred sixty-one".