21201741 has 18 divisors (see below), whose sum is σ = 33663630. Its totient is φ = 12848880.

The previous prime is 21201721. The next prime is 21201743. The reversal of 21201741 is 14710212.

It can be written as a sum of positive squares in only one way, i.e., 17015625 + 4186116 = 4125^2 + 2046^2 .

It is not a de Polignac number, because 21201741 - 2¹⁴ = 21185357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201743) 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 17 ways as a sum of consecutive naturals, for example, 8646 + ... + 10823.

Almost surely, 2^21201741 is an apocalyptic number.

It is an amenable number.

21201741 is a deficient number, since it is larger than the sum of its proper divisors (12461889).

21201741 is a wasteful number, since it uses less digits than its factorization.

21201741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19497 (or 19483 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21201741 is about 4604.5348299258. The cubic root of 21201741 is about 276.7730767595.

Adding to 21201741 its reverse (14710212), we get a palindrome (35911953).

The spelling of 21201741 in words is "twenty-one million, two hundred one thousand, seven hundred forty-one".