21040014441 has 4 divisors (see below), whose sum is σ = 28053352592. Its totient is φ = 14026676292.

The previous prime is 21040014389. The next prime is 21040014449. The reversal of 21040014441 is 14441004012.

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 not a de Polignac number, because 21040014441 - 2¹⁵ = 21039981673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21040014449) 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, 3506669071 + ... + 3506669076.

It is an arithmetic number, because the mean of its divisors is an integer number (7013338148).

Almost surely, 2^21040014441 is an apocalyptic number.

It is an amenable number.

21040014441 is a deficient number, since it is larger than the sum of its proper divisors (7013338151).

21040014441 is an equidigital number, since it uses as much as digits as its factorization.

21040014441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7013338150.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21040014441 its reverse (14441004012), we get a palindrome (35481018453).

The spelling of 21040014441 in words is "twenty-one billion, forty million, fourteen thousand, four hundred forty-one".