21302735 has 8 divisors (see below), whose sum is σ = 26388096. Its totient is φ = 16492320.

The previous prime is 21302731. The next prime is 21302741. The reversal of 21302735 is 53720312.

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

It is not a de Polignac number, because 21302735 - 2² = 21302731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21302735.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302731) 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 7 ways as a sum of consecutive naturals, for example, 68564 + ... + 68873.

It is an arithmetic number, because the mean of its divisors is an integer number (3298512).

Almost surely, 2^21302735 is an apocalyptic number.

21302735 is a deficient number, since it is larger than the sum of its proper divisors (5085361).

21302735 is a wasteful number, since it uses less digits than its factorization.

21302735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137473.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21302735 is about 4615.4885981876. The cubic root of 21302735 is about 277.2118481735.

The spelling of 21302735 in words is "twenty-one million, three hundred two thousand, seven hundred thirty-five".