21035441 has 4 divisors (see below), whose sum is σ = 24040512. Its totient is φ = 18030372.

The previous prime is 21035431. The next prime is 21035449. The reversal of 21035441 is 14453012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21035441 - 2¹⁰ = 21034417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035449) 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, 1502525 + ... + 1502538.

It is an arithmetic number, because the mean of its divisors is an integer number (6010128).

Almost surely, 2^21035441 is an apocalyptic number.

It is an amenable number.

21035441 is a deficient number, since it is larger than the sum of its proper divisors (3005071).

21035441 is an equidigital number, since it uses as much as digits as its factorization.

21035441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3005070.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21035441 is about 4586.4409949328. The cubic root of 21035441 is about 276.0475352208.

Adding to 21035441 its reverse (14453012), we get a palindrome (35488453).

The spelling of 21035441 in words is "twenty-one million, thirty-five thousand, four hundred forty-one".