21301011311 has 4 divisors (see below), whose sum is σ = 21301716000. Its totient is φ = 21300306624.

The previous prime is 21301011289. The next prime is 21301011323. The reversal of 21301011311 is 11311010312.

It is a happy number.

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 21301011311 - 2¹⁴ = 21300994927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301011331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304871 + ... + 368168.

It is an arithmetic number, because the mean of its divisors is an integer number (5325429000).

Almost surely, 2^21301011311 is an apocalyptic number.

21301011311 is a deficient number, since it is larger than the sum of its proper divisors (704689).

21301011311 is an equidigital number, since it uses as much as digits as its factorization.

21301011311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704688.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21301011311 its reverse (11311010312), we get a palindrome (32612021623).

Subtracting from 21301011311 its reverse (11311010312), we obtain a palindrome (9990000999).

The spelling of 21301011311 in words is "twenty-one billion, three hundred one million, eleven thousand, three hundred eleven".