21041024439 has 4 divisors (see below), whose sum is σ = 28054699256. Its totient is φ = 14027349624.

The previous prime is 21041024419. The next prime is 21041024467. The reversal of 21041024439 is 93442014012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21041024439 - 2⁸ = 21041024183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041024419) 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, 3506837404 + ... + 3506837409.

It is an arithmetic number, because the mean of its divisors is an integer number (7013674814).

Almost surely, 2^21041024439 is an apocalyptic number.

21041024439 is a deficient number, since it is larger than the sum of its proper divisors (7013674817).

21041024439 is an equidigital number, since it uses as much as digits as its factorization.

21041024439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7013674816.

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 21041024439 in words is "twenty-one billion, forty-one million, twenty-four thousand, four hundred thirty-nine".