21000324441 has 4 divisors (see below), whose sum is σ = 28000432592. Its totient is φ = 14000216292.

The previous prime is 21000324419. The next prime is 21000324463. The reversal of 21000324441 is 14442300012.

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 an interprime number because it is at equal distance from previous prime (21000324419) and next prime (21000324463).

It is not a de Polignac number, because 21000324441 - 2²² = 20996130137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000324481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3500054071 + ... + 3500054076.

It is an arithmetic number, because the mean of its divisors is an integer number (7000108148).

Almost surely, 2^21000324441 is an apocalyptic number.

It is an amenable number.

21000324441 is a deficient number, since it is larger than the sum of its proper divisors (7000108151).

21000324441 is an equidigital number, since it uses as much as digits as its factorization.

21000324441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000108150.

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

Adding to 21000324441 its reverse (14442300012), we get a palindrome (35442624453).

The spelling of 21000324441 in words is "twenty-one billion, three hundred twenty-four thousand, four hundred forty-one".