21360884 has 6 divisors (see below), whose sum is σ = 37381554. Its totient is φ = 10680440.

The previous prime is 21360881. The next prime is 21360917. The reversal of 21360884 is 48806312.

It can be written as a sum of positive squares in only one way, i.e., 13853284 + 7507600 = 3722^2 + 2740^2 .

It is a super-2 number, since 2×21360884² = 912574730522912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21360884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2670107 + ... + 2670114.

It is an arithmetic number, because the mean of its divisors is an integer number (6230259).

Almost surely, 2^21360884 is an apocalyptic number.

It is an amenable number.

21360884 is a deficient number, since it is larger than the sum of its proper divisors (16020670).

21360884 is a wasteful number, since it uses less digits than its factorization.

21360884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5340225 (or 5340223 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21360884 is about 4621.7836383803. The cubic root of 21360884 is about 277.4638494152.

The spelling of 21360884 in words is "twenty-one million, three hundred sixty thousand, eight hundred eighty-four".