21044432211 has 8 divisors (see below), whose sum is σ = 30610083264. Its totient is φ = 12754201320.

The previous prime is 21044432203. The next prime is 21044432221. The reversal of 21044432211 is 11223444012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21044432211 - 2³ = 21044432203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21044432221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318855001 + ... + 318855066.

It is an arithmetic number, because the mean of its divisors is an integer number (3826260408).

Almost surely, 2^21044432211 is an apocalyptic number.

21044432211 is a deficient number, since it is larger than the sum of its proper divisors (9565651053).

21044432211 is a wasteful number, since it uses less digits than its factorization.

21044432211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637710081.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21044432211 its reverse (11223444012), we get a palindrome (32267876223).

The spelling of 21044432211 in words is "twenty-one billion, forty-four million, four hundred thirty-two thousand, two hundred eleven".