21094648 has 8 divisors (see below), whose sum is σ = 39552480. Its totient is φ = 10547320.

The previous prime is 21094631. The next prime is 21094649. The reversal of 21094648 is 84649012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21094649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318408 + ... + 1318423.

It is an arithmetic number, because the mean of its divisors is an integer number (4944060).

Almost surely, 2^21094648 is an apocalyptic number.

It is an amenable number.

21094648 is a deficient number, since it is larger than the sum of its proper divisors (18457832).

21094648 is a wasteful number, since it uses less digits than its factorization.

21094648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636837 (or 2636833 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 21094648 is about 4592.8910285353. The cubic root of 21094648 is about 276.3062832435.

The spelling of 21094648 in words is "twenty-one million, ninety-four thousand, six hundred forty-eight".