21302347 has 8 divisors (see below), whose sum is σ = 24249600. Its totient is φ = 18523560.

The previous prime is 21302321. The next prime is 21302371. The reversal of 21302347 is 74320312.

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

It is not a de Polignac number, because 21302347 - 2⁷ = 21302219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21302387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41847 + ... + 42352.

It is an arithmetic number, because the mean of its divisors is an integer number (3031200).

Almost surely, 2^21302347 is an apocalyptic number.

21302347 is a deficient number, since it is larger than the sum of its proper divisors (2947253).

21302347 is a wasteful number, since it uses less digits than its factorization.

21302347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84233.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21302347 is about 4615.4465656099. The cubic root of 21302347 is about 277.2101651525.

Adding to 21302347 its reverse (74320312), we get a palindrome (95622659).

The spelling of 21302347 in words is "twenty-one million, three hundred two thousand, three hundred forty-seven".