21313113110221 has 2 divisors, whose sum is σ = 21313113110222. Its totient is φ = 21313113110220.

The previous prime is 21313113110207. The next prime is 21313113110269. The reversal of 21313113110221 is 12201131131312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19161508192996 + 2151604917225 = 4377386^2 + 1466835^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313113110221 - 2⁹ = 21313113109709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21313113110192 and 21313113110201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313113110921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656556555110 + 10656556555111.

It is an arithmetic number, because the mean of its divisors is an integer number (10656556555111).

Almost surely, 2^{21313113110221} is an apocalyptic number.

It is an amenable number.

21313113110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313113110221 is an equidigital number, since it uses as much as digits as its factorization.

21313113110221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 21313113110221 its reverse (12201131131312), we get a palindrome (33514244241533).

The spelling of 21313113110221 in words is "twenty-one trillion, three hundred thirteen billion, one hundred thirteen million, one hundred ten thousand, two hundred twenty-one".