21240404144 has 10 divisors (see below), whose sum is σ = 41153283060. Its totient is φ = 10620202064.

The previous prime is 21240404111. The next prime is 21240404201. The reversal of 21240404144 is 44140404212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663762614 + ... + 663762645.

It is an arithmetic number, because the mean of its divisors is an integer number (4115328306).

Almost surely, 2^21240404144 is an apocalyptic number.

It is an amenable number.

21240404144 is a deficient number, since it is larger than the sum of its proper divisors (19912878916).

21240404144 is a wasteful number, since it uses less digits than its factorization.

21240404144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327525267 (or 1327525261 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 21240404144 its reverse (44140404212), we get a palindrome (65380808356).

The spelling of 21240404144 in words is "twenty-one billion, two hundred forty million, four hundred four thousand, one hundred forty-four".