21152544344 has 8 divisors (see below), whose sum is σ = 39661020660. Its totient is φ = 10576272168.

The previous prime is 21152544341. The next prime is 21152544353. The reversal of 21152544344 is 44344525112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152544341) by changing a digit.

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, 1322034014 + ... + 1322034029.

Almost surely, 2^21152544344 is an apocalyptic number.

It is an amenable number.

21152544344 is a deficient number, since it is larger than the sum of its proper divisors (18508476316).

21152544344 is a wasteful number, since it uses less digits than its factorization.

21152544344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644068049 (or 2644068045 counting only the distinct ones).

The product of its digits is 76800, while the sum is 35.

The spelling of 21152544344 in words is "twenty-one billion, one hundred fifty-two million, five hundred forty-four thousand, three hundred forty-four".