21245341 has 4 divisors (see below), whose sum is σ = 22879612. Its totient is φ = 19611072.

The previous prime is 21245317. The next prime is 21245347. The reversal of 21245341 is 14354212.

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 4639716 + 16605625 = 2154^2 + 4075^2 .

It is not a de Polignac number, because 21245341 - 2⁵ = 21245309 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 (21245347) 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, 817116 + ... + 817141.

It is an arithmetic number, because the mean of its divisors is an integer number (5719903).

Almost surely, 2^21245341 is an apocalyptic number.

It is an amenable number.

21245341 is a deficient number, since it is larger than the sum of its proper divisors (1634271).

21245341 is a wasteful number, since it uses less digits than its factorization.

21245341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634270.

The product of its digits is 960, while the sum is 22.

The square root of 21245341 is about 4609.2668614434. The cubic root of 21245341 is about 276.9626687952.

Adding to 21245341 its reverse (14354212), we get a palindrome (35599553).

The spelling of 21245341 in words is "twenty-one million, two hundred forty-five thousand, three hundred forty-one".