210421043 has 12 divisors (see below), whose sum is σ = 255419280. Its totient is φ = 172518192.

The previous prime is 210421039. The next prime is 210421049. The reversal of 210421043 is 340124012.

It is not a de Polignac number, because 210421043 - 2² = 210421039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210421049) 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 in 11 ways as a sum of consecutive naturals, for example, 92228 + ... + 94481.

It is an arithmetic number, because the mean of its divisors is an integer number (21284940).

Almost surely, 2^210421043 is an apocalyptic number.

210421043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

210421043 is a deficient number, since it is larger than the sum of its proper divisors (44998237).

210421043 is a wasteful number, since it uses less digits than its factorization.

210421043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186746 (or 186739 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 210421043 is about 14505.8968354252. The cubic root of 210421043 is about 594.7891755965.

Adding to 210421043 its reverse (340124012), we get a palindrome (550545055).

The spelling of 210421043 in words is "two hundred ten million, four hundred twenty-one thousand, forty-three".