21030341 has 4 divisors (see below), whose sum is σ = 21137292. Its totient is φ = 20923392.

The previous prime is 21030337. The next prime is 21030379. The reversal of 21030341 is 14303012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18241441 + 2788900 = 4271^2 + 1670^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030341 - 2² = 21030337 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53180 + ... + 53573.

It is an arithmetic number, because the mean of its divisors is an integer number (5284323).

Almost surely, 2^21030341 is an apocalyptic number.

It is an amenable number.

21030341 is a deficient number, since it is larger than the sum of its proper divisors (106951).

21030341 is a wasteful number, since it uses less digits than its factorization.

21030341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106950.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21030341 is about 4585.8849745714. The cubic root of 21030341 is about 276.0252243627.

Adding to 21030341 its reverse (14303012), we get a palindrome (35333353).

The spelling of 21030341 in words is "twenty-one million, thirty thousand, three hundred forty-one".