21242021344 has 24 divisors (see below), whose sum is σ = 42324093000. Its totient is φ = 10493045376.

The previous prime is 21242021293. The next prime is 21242021369. The reversal of 21242021344 is 44312024212.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3996219 + ... + 4001530.

It is an arithmetic number, because the mean of its divisors is an integer number (1763503875).

Almost surely, 2^21242021344 is an apocalyptic number.

It is an amenable number.

21242021344 is a deficient number, since it is larger than the sum of its proper divisors (21082071656).

21242021344 is an equidigital number, since it uses as much as digits as its factorization.

21242021344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7997842 (or 7997834 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21242021344 its reverse (44312024212), we get a palindrome (65554045556).

The spelling of 21242021344 in words is "twenty-one billion, two hundred forty-two million, twenty-one thousand, three hundred forty-four".