21030241 has 12 divisors (see below), whose sum is σ = 22778172. Its totient is φ = 19405568.

The previous prime is 21030239. The next prime is 21030287. The reversal of 21030241 is 14203012.

It can be written as a sum of positive squares in 6 ways, for example, as 9740641 + 11289600 = 3121^2 + 3360^2 .

It is not a de Polignac number, because 21030241 - 2¹ = 21030239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14631 + ... + 16003.

It is an arithmetic number, because the mean of its divisors is an integer number (1898181).

Almost surely, 2^21030241 is an apocalyptic number.

It is an amenable number.

21030241 is a deficient number, since it is larger than the sum of its proper divisors (1747931).

21030241 is a wasteful number, since it uses less digits than its factorization.

21030241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 1443 counting only the distinct ones).

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

The square root of 21030241 is about 4585.8740715375. The cubic root of 21030241 is about 276.0247868588.

Adding to 21030241 its reverse (14203012), we get a palindrome (35233253).

The spelling of 21030241 in words is "twenty-one million, thirty thousand, two hundred forty-one".