21050341 has 4 divisors (see below), whose sum is σ = 22669612. Its totient is φ = 19431072.

The previous prime is 21050339. The next prime is 21050357. The reversal of 21050341 is 14305012.

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 4322241 + 16728100 = 2079^2 + 4090^2 .

It is a cyclic number.

It is not a de Polignac number, because 21050341 - 2¹ = 21050339 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 (21050311) 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, 809616 + ... + 809641.

It is an arithmetic number, because the mean of its divisors is an integer number (5667403).

Almost surely, 2^21050341 is an apocalyptic number.

It is an amenable number.

21050341 is a deficient number, since it is larger than the sum of its proper divisors (1619271).

21050341 is a wasteful number, since it uses less digits than its factorization.

21050341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619270.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21050341 is about 4588.0650605675. The cubic root of 21050341 is about 276.1126972730.

Adding to 21050341 its reverse (14305012), we get a palindrome (35355353).

The spelling of 21050341 in words is "twenty-one million, fifty thousand, three hundred forty-one".