21321207044 has 48 divisors (see below), whose sum is σ = 38931809280. Its totient is φ = 10204548480.

The previous prime is 21321207007. The next prime is 21321207059. The reversal of 21321207044 is 44070212312.

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, 7704149 + ... + 7706915.

It is an arithmetic number, because the mean of its divisors is an integer number (811079360).

Almost surely, 2^21321207044 is an apocalyptic number.

It is an amenable number.

21321207044 is a deficient number, since it is larger than the sum of its proper divisors (17610602236).

21321207044 is a wasteful number, since it uses less digits than its factorization.

21321207044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3348 (or 3346 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

Adding to 21321207044 its reverse (44070212312), we get a palindrome (65391419356).

The spelling of 21321207044 in words is "twenty-one billion, three hundred twenty-one million, two hundred seven thousand, forty-four".