21365252313 has 8 divisors (see below), whose sum is σ = 28524439776. Its totient is φ = 14224783200.

The previous prime is 21365252309. The next prime is 21365252329. The reversal of 21365252313 is 31325256312.

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

It is not a de Polignac number, because 21365252313 - 2² = 21365252309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21365252303) 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, 4676923 + ... + 4681488.

It is an arithmetic number, because the mean of its divisors is an integer number (3565554972).

Almost surely, 2^21365252313 is an apocalyptic number.

It is an amenable number.

21365252313 is a deficient number, since it is larger than the sum of its proper divisors (7159187463).

21365252313 is an equidigital number, since it uses as much as digits as its factorization.

21365252313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9359175.

The product of its digits is 32400, while the sum is 33.

The spelling of 21365252313 in words is "twenty-one billion, three hundred sixty-five million, two hundred fifty-two thousand, three hundred thirteen".