21202441 has 8 divisors (see below), whose sum is σ = 23208584. Its totient is φ = 19249920.

The previous prime is 21202429. The next prime is 21202459. The reversal of 21202441 is 14420212.

It can be written as a sum of positive squares in 4 ways, for example, as 5625 + 21196816 = 75^2 + 4604^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21202441 - 2⁵ = 21202409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12576 + ... + 14161.

It is an arithmetic number, because the mean of its divisors is an integer number (2901073).

Almost surely, 2^21202441 is an apocalyptic number.

It is an amenable number.

21202441 is a deficient number, since it is larger than the sum of its proper divisors (2006143).

21202441 is a wasteful number, since it uses less digits than its factorization.

21202441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26811.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21202441 is about 4604.6108413198. The cubic root of 21202441 is about 276.7761227204.

Adding to 21202441 its reverse (14420212), we get a palindrome (35622653).

The spelling of 21202441 in words is "twenty-one million, two hundred two thousand, four hundred forty-one".