21663033554444 has 12 divisors (see below), whose sum is σ = 37947732526704. Its totient is φ = 10820824261104.

The previous prime is 21663033554441. The next prime is 21663033554471. The reversal of 21663033554444 is 44445533036612.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21663033554392 and 21663033554401.

It is not an unprimeable number, because it can be changed into a prime (21663033554441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2673124472 + ... + 2673132575.

It is an arithmetic number, because the mean of its divisors is an integer number (3162311043892).

Almost surely, 2^{21663033554444} is an apocalyptic number.

It is an amenable number.

21663033554444 is a deficient number, since it is larger than the sum of its proper divisors (16284698972260).

21663033554444 is a wasteful number, since it uses less digits than its factorization.

21663033554444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346258064 (or 5346258062 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 50.

The spelling of 21663033554444 in words is "twenty-one trillion, six hundred sixty-three billion, thirty-three million, five hundred fifty-four thousand, four hundred forty-four".