21041345144 has 16 divisors (see below), whose sum is σ = 40370023320. Its totient is φ = 10276005600.

The previous prime is 21041345137. The next prime is 21041345147. The reversal of 21041345144 is 44154314012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041345147) 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, 30583007 + ... + 30583694.

Almost surely, 2^21041345144 is an apocalyptic number.

It is an amenable number.

21041345144 is a deficient number, since it is larger than the sum of its proper divisors (19328678176).

21041345144 is a wasteful number, since it uses less digits than its factorization.

21041345144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61166750 (or 61166746 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 21041345144 its reverse (44154314012), we get a palindrome (65195659156).

The spelling of 21041345144 in words is "twenty-one billion, forty-one million, three hundred forty-five thousand, one hundred forty-four".