21326013244 has 6 divisors (see below), whose sum is σ = 37320523184. Its totient is φ = 10663006620.

The previous prime is 21326013229. The next prime is 21326013251. The reversal of 21326013244 is 44231062312.

It is a happy number.

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 as a sum of consecutive naturals, namely, 2665751652 + ... + 2665751659.

Almost surely, 2^21326013244 is an apocalyptic number.

It is an amenable number.

21326013244 is a deficient number, since it is larger than the sum of its proper divisors (15994509940).

21326013244 is a wasteful number, since it uses less digits than its factorization.

21326013244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331503315 (or 5331503313 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21326013244 its reverse (44231062312), we get a palindrome (65557075556).

The spelling of 21326013244 in words is "twenty-one billion, three hundred twenty-six million, thirteen thousand, two hundred forty-four".