21095056 has 10 divisors (see below), whose sum is σ = 40871702. Its totient is φ = 10547520.

The previous prime is 21095051. The next prime is 21095059. The reversal of 21095056 is 65059012.

It can be written as a sum of positive squares in only one way, i.e., 15335056 + 5760000 = 3916^2 + 2400^2 .

It is not an unprimeable number, because it can be changed into a prime (21095051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659205 + ... + 659236.

Almost surely, 2^21095056 is an apocalyptic number.

It is an amenable number.

21095056 is a deficient number, since it is larger than the sum of its proper divisors (19776646).

21095056 is a wasteful number, since it uses less digits than its factorization.

21095056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318449 (or 1318443 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 21095056 is about 4592.9354447891. The cubic root of 21095056 is about 276.3080646153.

It can be divided in two parts, 210 and 95056, that added together give a triangular number (95266 = T₄₃₆).

The spelling of 21095056 in words is "twenty-one million, ninety-five thousand, fifty-six".