21321412311 has 4 divisors (see below), whose sum is σ = 28428549752. Its totient is φ = 14214274872.

The previous prime is 21321412303. The next prime is 21321412331. The reversal of 21321412311 is 11321412312.

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

It is not a de Polignac number, because 21321412311 - 2³ = 21321412303 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 (21321412331) 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, 3553568716 + ... + 3553568721.

It is an arithmetic number, because the mean of its divisors is an integer number (7107137438).

Almost surely, 2^21321412311 is an apocalyptic number.

21321412311 is a deficient number, since it is larger than the sum of its proper divisors (7107137441).

21321412311 is an equidigital number, since it uses as much as digits as its factorization.

21321412311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107137440.

The product of its digits is 288, while the sum is 21.

Adding to 21321412311 its reverse (11321412312), we get a palindrome (32642824623).

Subtracting from 21321412311 its reverse (11321412312), we obtain a palindrome (9999999999).

The spelling of 21321412311 in words is "twenty-one billion, three hundred twenty-one million, four hundred twelve thousand, three hundred eleven".