21200211111113 has 2 divisors, whose sum is σ = 21200211111114. Its totient is φ = 21200211111112.

The previous prime is 21200211111109. The next prime is 21200211111133. The reversal of 21200211111113 is 31111111200212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15582377292304 + 5617833818809 = 3947452^2 + 2370197^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200211111113 - 2² = 21200211111109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200211111091 and 21200211111100.

It is not a weakly prime, because it can be changed into another prime (21200211111133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600105555556 + 10600105555557.

It is an arithmetic number, because the mean of its divisors is an integer number (10600105555557).

Almost surely, 2^{21200211111113} is an apocalyptic number.

It is an amenable number.

21200211111113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200211111113 is an equidigital number, since it uses as much as digits as its factorization.

21200211111113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 21200211111113 its reverse (31111111200212), we get a palindrome (52311322311325).

The spelling of 21200211111113 in words is "twenty-one trillion, two hundred billion, two hundred eleven million, one hundred eleven thousand, one hundred thirteen".