21056655244 has 6 divisors (see below), whose sum is σ = 36849146684. Its totient is φ = 10528327620.

The previous prime is 21056655229. The next prime is 21056655253. The reversal of 21056655244 is 44255665012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21056655197 and 21056655206.

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, 2632081902 + ... + 2632081909.

Almost surely, 2^21056655244 is an apocalyptic number.

It is an amenable number.

21056655244 is a deficient number, since it is larger than the sum of its proper divisors (15792491440).

21056655244 is a wasteful number, since it uses less digits than its factorization.

21056655244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264163815 (or 5264163813 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 21056655244 in words is "twenty-one billion, fifty-six million, six hundred fifty-five thousand, two hundred forty-four".