21226674544 has 20 divisors (see below), whose sum is σ = 41129526024. Its totient is φ = 10612603328.

The previous prime is 21226674523. The next prime is 21226674551. The reversal of 21226674544 is 44547662212.

It is a self number, because there is not a number n which added to its sum of digits gives 21226674544.

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, 250914 + ... + 324670.

Almost surely, 2^21226674544 is an apocalyptic number.

It is an amenable number.

21226674544 is a deficient number, since it is larger than the sum of its proper divisors (19902851480).

21226674544 is a wasteful number, since it uses less digits than its factorization.

21226674544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91752 (or 91746 counting only the distinct ones).

The product of its digits is 645120, while the sum is 43.

The spelling of 21226674544 in words is "twenty-one billion, two hundred twenty-six million, six hundred seventy-four thousand, five hundred forty-four".