21455674036844 has 12 divisors (see below), whose sum is σ = 37579222485168. Its totient is φ = 10718753326800.

The previous prime is 21455674036793. The next prime is 21455674036957. The reversal of 21455674036844 is 44863047655412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2270917592 + ... + 2270927039.

It is an arithmetic number, because the mean of its divisors is an integer number (3131601873764).

Almost surely, 2^{21455674036844} is an apocalyptic number.

It is an amenable number.

21455674036844 is a deficient number, since it is larger than the sum of its proper divisors (16123548448324).

21455674036844 is a wasteful number, since it uses less digits than its factorization.

21455674036844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4541845816 (or 4541845814 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 59.

The spelling of 21455674036844 in words is "twenty-one trillion, four hundred fifty-five billion, six hundred seventy-four million, thirty-six thousand, eight hundred forty-four".