21441261 has 8 divisors (see below), whose sum is σ = 28612864. Its totient is φ = 14281920.

The previous prime is 21441247. The next prime is 21441271. The reversal of 21441261 is 16214412.

It is a happy number.

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

It is not a de Polignac number, because 21441261 - 2⁵ = 21441229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441271) 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, 2421 + ... + 6981.

It is an arithmetic number, because the mean of its divisors is an integer number (3576608).

Almost surely, 2^21441261 is an apocalyptic number.

It is an amenable number.

21441261 is a deficient number, since it is larger than the sum of its proper divisors (7171603).

21441261 is a wasteful number, since it uses less digits than its factorization.

21441261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6131.

The product of its digits is 384, while the sum is 21.

The square root of 21441261 is about 4630.4709263746. The cubic root of 21441261 is about 277.8114286285.

Adding to 21441261 its reverse (16214412), we get a palindrome (37655673).

The spelling of 21441261 in words is "twenty-one million, four hundred forty-one thousand, two hundred sixty-one".