21294881144 has 16 divisors (see below), whose sum is σ = 39934413720. Its totient is φ = 10645704160.

The previous prime is 21294881143. The next prime is 21294881159. The reversal of 21294881144 is 44118849212.

It is a junction number, because it is equal to n+sod(n) for n = 21294881095 and 21294881104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294881143) 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, 164174 + ... + 263709.

Almost surely, 2^21294881144 is an apocalyptic number.

It is an amenable number.

21294881144 is a deficient number, since it is larger than the sum of its proper divisors (18639532576).

21294881144 is a wasteful number, since it uses less digits than its factorization.

21294881144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434110 (or 434106 counting only the distinct ones).

The product of its digits is 147456, while the sum is 44.

The spelling of 21294881144 in words is "twenty-one billion, two hundred ninety-four million, eight hundred eighty-one thousand, one hundred forty-four".