11211211220213 has 2 divisors, whose sum is σ = 11211211220214. Its totient is φ = 11211211220212.

The previous prime is 11211211220207. The next prime is 11211211220221. The reversal of 11211211220213 is 31202211211211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6640197152164 + 4571014068049 = 2576858^2 + 2137993^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211211220213 - 2¹⁰ = 11211211219189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211211220203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605605610106 + 5605605610107.

It is an arithmetic number, because the mean of its divisors is an integer number (5605605610107).

Almost surely, 2^{11211211220213} is an apocalyptic number.

It is an amenable number.

11211211220213 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211211220213 is an equidigital number, since it uses as much as digits as its factorization.

11211211220213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 11211211220213 its reverse (31202211211211), we get a palindrome (42413422431424).

The spelling of 11211211220213 in words is "eleven trillion, two hundred eleven billion, two hundred eleven million, two hundred twenty thousand, two hundred thirteen".