21268504844 has 6 divisors (see below), whose sum is σ = 37219883484. Its totient is φ = 10634252420.

The previous prime is 21268504837. The next prime is 21268504919. The reversal of 21268504844 is 44840586212.

It is a junction number, because it is equal to n+sod(n) for n = 21268504795 and 21268504804.

It is an unprimeable number.

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, 2658563102 + ... + 2658563109.

It is an arithmetic number, because the mean of its divisors is an integer number (6203313914).

Almost surely, 2^21268504844 is an apocalyptic number.

It is an amenable number.

21268504844 is a deficient number, since it is larger than the sum of its proper divisors (15951378640).

21268504844 is a wasteful number, since it uses less digits than its factorization.

21268504844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5317126215 (or 5317126213 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 44.

The spelling of 21268504844 in words is "twenty-one billion, two hundred sixty-eight million, five hundred four thousand, eight hundred forty-four".