21302345 has 8 divisors (see below), whose sum is σ = 25764864. Its totient is φ = 16907184.

The previous prime is 21302321. The next prime is 21302371. The reversal of 21302345 is 54320312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21302345 - 2¹⁰ = 21301321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16139 + ... + 17408.

It is an arithmetic number, because the mean of its divisors is an integer number (3220608).

Almost surely, 2^21302345 is an apocalyptic number.

It is an amenable number.

21302345 is a deficient number, since it is larger than the sum of its proper divisors (4462519).

21302345 is a wasteful number, since it uses less digits than its factorization.

21302345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33679.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21302345 is about 4615.4463489461. The cubic root of 21302345 is about 277.2101564771.

Adding to 21302345 its reverse (54320312), we get a palindrome (75622657).

The spelling of 21302345 in words is "twenty-one million, three hundred two thousand, three hundred forty-five".