421443193 has 2 divisors, whose sum is σ = 421443194. Its totient is φ = 421443192.

The previous prime is 421443181. The next prime is 421443229. The reversal of 421443193 is 391344124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383102329 + 38340864 = 19573^2 + 6192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421443193 is a prime.

It is a super-2 number, since 2×421443193² = 355228729852070498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421444193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210721596 + 210721597.

It is an arithmetic number, because the mean of its divisors is an integer number (210721597).

Almost surely, 2^421443193 is an apocalyptic number.

It is an amenable number.

421443193 is a deficient number, since it is larger than the sum of its proper divisors (1).

421443193 is an equidigital number, since it uses as much as digits as its factorization.

421443193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 421443193 is about 20529.0816404436. The cubic root of 421443193 is about 749.7440270174.

The spelling of 421443193 in words is "four hundred twenty-one million, four hundred forty-three thousand, one hundred ninety-three".