21360935 has 4 divisors (see below), whose sum is σ = 25633128. Its totient is φ = 17088744.

The previous prime is 21360931. The next prime is 21360943. The reversal of 21360935 is 53906312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21360935 - 2² = 21360931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21360898 and 21360907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21360931) 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 in 3 ways as a sum of consecutive naturals, for example, 2136089 + ... + 2136098.

It is an arithmetic number, because the mean of its divisors is an integer number (6408282).

Almost surely, 2^21360935 is an apocalyptic number.

21360935 is a deficient number, since it is larger than the sum of its proper divisors (4272193).

21360935 is an equidigital number, since it uses as much as digits as its factorization.

21360935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4272192.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 21360935 is about 4621.7891557275. The cubic root of 21360935 is about 277.4640702338.

The spelling of 21360935 in words is "twenty-one million, three hundred sixty thousand, nine hundred thirty-five".