421566043 has 2 divisors, whose sum is σ = 421566044. Its totient is φ = 421566042.

The previous prime is 421566031. The next prime is 421566073. The reversal of 421566043 is 340665124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421566043 - 2²¹ = 419468891 is a prime.

It is a super-2 number, since 2×421566043² = 355435857221355698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421565996 and 421566014.

It is not a weakly prime, because it can be changed into another prime (421566073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210783021 + 210783022.

It is an arithmetic number, because the mean of its divisors is an integer number (210783022).

Almost surely, 2^421566043 is an apocalyptic number.

421566043 is a deficient number, since it is larger than the sum of its proper divisors (1).

421566043 is an equidigital number, since it uses as much as digits as its factorization.

421566043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 421566043 is about 20532.0735192527. The cubic root of 421566043 is about 749.8168696584.

The spelling of 421566043 in words is "four hundred twenty-one million, five hundred sixty-six thousand, forty-three".