43221961 has 2 divisors, whose sum is σ = 43221962. Its totient is φ = 43221960.

The previous prime is 43221953. The next prime is 43222033. The reversal of 43221961 is 16912234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40246336 + 2975625 = 6344^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 43221961 - 2³ = 43221953 is a prime.

It is equal to p_2617174 and since 43221961 and 2617174 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (43221931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21610980 + 21610981.

It is an arithmetic number, because the mean of its divisors is an integer number (21610981).

Almost surely, 2^43221961 is an apocalyptic number.

It is an amenable number.

43221961 is a deficient number, since it is larger than the sum of its proper divisors (1).

43221961 is an equidigital number, since it uses as much as digits as its factorization.

43221961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 43221961 is about 6574.3411076700. The cubic root of 43221961 is about 350.9415762479.

The spelling of 43221961 in words is "forty-three million, two hundred twenty-one thousand, nine hundred sixty-one".