21131312299 has 4 divisors (see below), whose sum is σ = 21139179264. Its totient is φ = 21123445336.

The previous prime is 21131312297. The next prime is 21131312311. The reversal of 21131312299 is 99221313112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21131312299 - 2¹ = 21131312297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131312297) 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 3 ways as a sum of consecutive naturals, for example, 3929452 + ... + 3934825.

It is an arithmetic number, because the mean of its divisors is an integer number (5284794816).

Almost surely, 2^21131312299 is an apocalyptic number.

21131312299 is a deficient number, since it is larger than the sum of its proper divisors (7866965).

21131312299 is an equidigital number, since it uses as much as digits as its factorization.

21131312299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866964.

The product of its digits is 5832, while the sum is 34.

The spelling of 21131312299 in words is "twenty-one billion, one hundred thirty-one million, three hundred twelve thousand, two hundred ninety-nine".