21107741 has 4 divisors (see below), whose sum is σ = 21301500. Its totient is φ = 20913984.

The previous prime is 21107729. The next prime is 21107753. The reversal of 21107741 is 14770112.

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

It is an interprime number because it is at equal distance from previous prime (21107729) and next prime (21107753).

It can be written as a sum of positive squares in 2 ways, for example, as 19175641 + 1932100 = 4379^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 21107741 - 2¹⁰ = 21106717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21107701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96716 + ... + 96933.

It is an arithmetic number, because the mean of its divisors is an integer number (5325375).

Almost surely, 2^21107741 is an apocalyptic number.

It is an amenable number.

21107741 is a deficient number, since it is larger than the sum of its proper divisors (193759).

21107741 is a wasteful number, since it uses less digits than its factorization.

21107741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193758.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 21107741 is about 4594.3161623902. The cubic root of 21107741 is about 276.3634372343.

Adding to 21107741 its reverse (14770112), we get a palindrome (35877853).

The spelling of 21107741 in words is "twenty-one million, one hundred seven thousand, seven hundred forty-one".