21600241 has 4 divisors (see below), whose sum is σ = 23261812. Its totient is φ = 19938672.

The previous prime is 21600239. The next prime is 21600263. The reversal of 21600241 is 14200612.

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 14861025 + 6739216 = 3855^2 + 2596^2 .

It is not a de Polignac number, because 21600241 - 2¹ = 21600239 is a prime.

It is a super-2 number, since 2×21600241² = 933140822516162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21600641) 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, 830766 + ... + 830791.

It is an arithmetic number, because the mean of its divisors is an integer number (5815453).

Almost surely, 2^21600241 is an apocalyptic number.

It is an amenable number.

21600241 is a deficient number, since it is larger than the sum of its proper divisors (1661571).

21600241 is a wasteful number, since it uses less digits than its factorization.

21600241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661570.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21600241 is about 4647.6059428484. The cubic root of 21600241 is about 278.4963657749.

Adding to 21600241 its reverse (14200612), we get a palindrome (35800853).

The spelling of 21600241 in words is "twenty-one million, six hundred thousand, two hundred forty-one".