21321102444 has 48 divisors (see below), whose sum is σ = 51179468256. Its totient is φ = 6903360000.

The previous prime is 21321102431. The next prime is 21321102487. The reversal of 21321102444 is 44420112312.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 226894 + ... + 306794.

It is an arithmetic number, because the mean of its divisors is an integer number (1066238922).

Almost surely, 2^21321102444 is an apocalyptic number.

It is an amenable number.

21321102444 is an abundant number, since it is smaller than the sum of its proper divisors (29858365812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21321102444 is a wasteful number, since it uses less digits than its factorization.

21321102444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80546 (or 80544 counting only the distinct ones).

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

Adding to 21321102444 its reverse (44420112312), we get a palindrome (65741214756).

The spelling of 21321102444 in words is "twenty-one billion, three hundred twenty-one million, one hundred two thousand, four hundred forty-four".