210534021 has 6 divisors (see below), whose sum is σ = 304104710. Its totient is φ = 140356008.

The previous prime is 210534013. The next prime is 210534043. The reversal of 210534021 is 120435012.

210534021 is a `hidden beast` number, since 210 + 53 + 402 + 1 = 666.

210534021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 149084100 + 61449921 = 12210^2 + 7839^2 .

It is not a de Polignac number, because 210534021 - 2³ = 210534013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210533985 and 210534003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210534011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11696326 + ... + 11696343.

Almost surely, 2^210534021 is an apocalyptic number.

It is an amenable number.

210534021 is a deficient number, since it is larger than the sum of its proper divisors (93570689).

210534021 is a wasteful number, since it uses less digits than its factorization.

210534021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23392675 (or 23392672 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 210534021 is about 14509.7905222646. The cubic root of 210534021 is about 594.8956067587.

Adding to 210534021 its reverse (120435012), we get a palindrome (330969033).

Subtracting from 210534021 its reverse (120435012), we obtain a palindrome (90099009).

The spelling of 210534021 in words is "two hundred ten million, five hundred thirty-four thousand, twenty-one".