21158985313 has 8 divisors (see below), whose sum is σ = 21232673280. Its totient is φ = 21085421280.

The previous prime is 21158985283. The next prime is 21158985329. The reversal of 21158985313 is 31358985112.

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 21158985313 - 2²⁵ = 21125430881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21158985343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317853 + ... + 378613.

It is an arithmetic number, because the mean of its divisors is an integer number (2654084160).

Almost surely, 2^21158985313 is an apocalyptic number.

It is an amenable number.

21158985313 is a deficient number, since it is larger than the sum of its proper divisors (73687967).

21158985313 is an equidigital number, since it uses as much as digits as its factorization.

21158985313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61967.

The product of its digits is 259200, while the sum is 46.

The spelling of 21158985313 in words is "twenty-one billion, one hundred fifty-eight million, nine hundred eighty-five thousand, three hundred thirteen".