21360634 has 8 divisors (see below), whose sum is σ = 32492448. Its totient is φ = 10529820.

The previous prime is 21360601. The next prime is 21360641. The reversal of 21360634 is 43606312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21360599 and 21360608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75072 + ... + 75355.

It is an arithmetic number, because the mean of its divisors is an integer number (4061556).

Almost surely, 2^21360634 is an apocalyptic number.

21360634 is a deficient number, since it is larger than the sum of its proper divisors (11131814).

21360634 is a wasteful number, since it uses less digits than its factorization.

21360634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150500.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 21360634 is about 4621.7565924657. The cubic root of 21360634 is about 277.4627669657.

Adding to 21360634 its reverse (43606312), we get a palindrome (64966946).

The spelling of 21360634 in words is "twenty-one million, three hundred sixty thousand, six hundred thirty-four".