21385577144 has 16 divisors (see below), whose sum is σ = 40099703400. Its totient is φ = 10692322912.

The previous prime is 21385577141. The next prime is 21385577179. The reversal of 21385577144 is 44177558312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21385577141) 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 in 3 ways as a sum of consecutive naturals, for example, 209279 + ... + 294225.

Almost surely, 2^21385577144 is an apocalyptic number.

It is an amenable number.

21385577144 is a deficient number, since it is larger than the sum of its proper divisors (18714126256).

21385577144 is a wasteful number, since it uses less digits than its factorization.

21385577144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116422 (or 116418 counting only the distinct ones).

The product of its digits is 940800, while the sum is 47.

The spelling of 21385577144 in words is "twenty-one billion, three hundred eighty-five million, five hundred seventy-seven thousand, one hundred forty-four".