21106775044 has 6 divisors (see below), whose sum is σ = 36936856334. Its totient is φ = 10553387520.

The previous prime is 21106775029. The next prime is 21106775083. The reversal of 21106775044 is 44057760112.

It can be written as a sum of positive squares in only one way, i.e., 19301544900 + 1805230144 = 138930^2 + 42488^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21106774994 and 21106775012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638346877 + ... + 2638346884.

Almost surely, 2^21106775044 is an apocalyptic number.

It is an amenable number.

21106775044 is a deficient number, since it is larger than the sum of its proper divisors (15830081290).

21106775044 is a wasteful number, since it uses less digits than its factorization.

21106775044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276693765 (or 5276693763 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 21106775044 in words is "twenty-one billion, one hundred six million, seven hundred seventy-five thousand, forty-four".