21362648 has 8 divisors (see below), whose sum is σ = 40054980. Its totient is φ = 10681320.

The previous prime is 21362641. The next prime is 21362651. The reversal of 21362648 is 84626312.

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 (21362641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335158 + ... + 1335173.

Almost surely, 2^21362648 is an apocalyptic number.

It is an amenable number.

21362648 is a deficient number, since it is larger than the sum of its proper divisors (18692332).

21362648 is a wasteful number, since it uses less digits than its factorization.

21362648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670337 (or 2670333 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 21362648 is about 4621.9744698559. The cubic root of 21362648 is about 277.4714869386.

The spelling of 21362648 in words is "twenty-one million, three hundred sixty-two thousand, six hundred forty-eight".