21441243 has 8 divisors (see below), whose sum is σ = 29510656. Its totient is φ = 13833000.

The previous prime is 21441239. The next prime is 21441247. The reversal of 21441243 is 34214412.

It is an interprime number because it is at equal distance from previous prime (21441239) and next prime (21441247).

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

It is not a de Polignac number, because 21441243 - 2² = 21441239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441247) 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, 115183 + ... + 115368.

It is an arithmetic number, because the mean of its divisors is an integer number (3688832).

Almost surely, 2^21441243 is an apocalyptic number.

21441243 is a deficient number, since it is larger than the sum of its proper divisors (8069413).

21441243 is a wasteful number, since it uses less digits than its factorization.

21441243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230585.

The product of its digits is 768, while the sum is 21.

The square root of 21441243 is about 4630.4689827273. The cubic root of 21441243 is about 277.8113508873.

Adding to 21441243 its reverse (34214412), we get a palindrome (55655655).

The spelling of 21441243 in words is "twenty-one million, four hundred forty-one thousand, two hundred forty-three".