21606346444 has 12 divisors (see below), whose sum is σ = 37826989984. Its totient is φ = 10798635024.

The previous prime is 21606346417. The next prime is 21606346457. The reversal of 21606346444 is 44464360612.

It is a junction number, because it is equal to n+sod(n) for n = 21606346397 and 21606346406.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123827 + ... + 1142890.

Almost surely, 2^21606346444 is an apocalyptic number.

It is an amenable number.

21606346444 is a deficient number, since it is larger than the sum of its proper divisors (16220643540).

21606346444 is a wasteful number, since it uses less digits than its factorization.

21606346444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269104 (or 2269102 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 21606346444 in words is "twenty-one billion, six hundred six million, three hundred forty-six thousand, four hundred forty-four".