21331211113 has 2 divisors, whose sum is σ = 21331211114. Its totient is φ = 21331211112.

The previous prime is 21331211071. The next prime is 21331211117. The reversal of 21331211113 is 31111213312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20164852009 + 1166359104 = 142003^2 + 34152^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331211113 - 2¹⁷ = 21331080041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21331211117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665605556 + 10665605557.

It is an arithmetic number, because the mean of its divisors is an integer number (10665605557).

Almost surely, 2^21331211113 is an apocalyptic number.

It is an amenable number.

21331211113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331211113 is an equidigital number, since it uses as much as digits as its factorization.

21331211113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 19.

Adding to 21331211113 its reverse (31111213312), we get a palindrome (52442424425).

The spelling of 21331211113 in words is "twenty-one billion, three hundred thirty-one million, two hundred eleven thousand, one hundred thirteen".