210021043 has 16 divisors (see below), whose sum is σ = 226851840. Its totient is φ = 193729536.

The previous prime is 210020989. The next prime is 210021047. The reversal of 210021043 is 340120012.

It is a cyclic number.

It is not a de Polignac number, because 210021043 - 2²⁵ = 176466611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210021047) 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 15 ways as a sum of consecutive naturals, for example, 191605 + ... + 192697.

It is an arithmetic number, because the mean of its divisors is an integer number (14178240).

Almost surely, 2^210021043 is an apocalyptic number.

210021043 is a deficient number, since it is larger than the sum of its proper divisors (16830797).

210021043 is a wasteful number, since it uses less digits than its factorization.

210021043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 210021043 is about 14492.1027804801. The cubic root of 210021043 is about 594.4120482560.

Adding to 210021043 its reverse (340120012), we get a palindrome (550141055).

The spelling of 210021043 in words is "two hundred ten million, twenty-one thousand, forty-three".