21160735 has 4 divisors (see below), whose sum is σ = 25392888. Its totient is φ = 16928584.

The previous prime is 21160721. The next prime is 21160747. The reversal of 21160735 is 53706112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21160735 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2116069 + ... + 2116078.

It is an arithmetic number, because the mean of its divisors is an integer number (6348222).

Almost surely, 2^21160735 is an apocalyptic number.

21160735 is a deficient number, since it is larger than the sum of its proper divisors (4232153).

21160735 is an equidigital number, since it uses as much as digits as its factorization.

21160735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4232152.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21160735 is about 4600.0798906106. The cubic root of 21160735 is about 276.5945272474.

Adding to 21160735 its reverse (53706112), we get a palindrome (74866847).

The spelling of 21160735 in words is "twenty-one million, one hundred sixty thousand, seven hundred thirty-five".