21303441 has 6 divisors (see below), whose sum is σ = 30771650. Its totient is φ = 14202288.

The previous prime is 21303421. The next prime is 21303467. The reversal of 21303441 is 14430312.

It can be written as a sum of positive squares in only one way, i.e., 20657025 + 646416 = 4545^2 + 804^2 .

It is not a de Polignac number, because 21303441 - 2⁵ = 21303409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183516 + ... + 1183533.

Almost surely, 2^21303441 is an apocalyptic number.

It is an amenable number.

21303441 is a deficient number, since it is larger than the sum of its proper divisors (9468209).

21303441 is a wasteful number, since it uses less digits than its factorization.

21303441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367055 (or 2367052 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21303441 is about 4615.5650791642. The cubic root of 21303441 is about 277.2149105252.

Adding to 21303441 its reverse (14430312), we get a palindrome (35733753).

The spelling of 21303441 in words is "twenty-one million, three hundred three thousand, four hundred forty-one".