43221697 has 2 divisors, whose sum is σ = 43221698. Its totient is φ = 43221696.

The previous prime is 43221691. The next prime is 43221707. The reversal of 43221697 is 79612234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42302016 + 919681 = 6504^2 + 959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43221697 is a prime.

It is not a weakly prime, because it can be changed into another prime (43221691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21610848 + 21610849.

It is an arithmetic number, because the mean of its divisors is an integer number (21610849).

Almost surely, 2^43221697 is an apocalyptic number.

It is an amenable number.

43221697 is a deficient number, since it is larger than the sum of its proper divisors (1).

43221697 is an equidigital number, since it uses as much as digits as its factorization.

43221697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 43221697 is about 6574.3210295817. The cubic root of 43221697 is about 350.9408617287.

The spelling of 43221697 in words is "forty-three million, two hundred twenty-one thousand, six hundred ninety-seven".