11320212211981 has 2 divisors, whose sum is σ = 11320212211982. Its totient is φ = 11320212211980.

The previous prime is 11320212211961. The next prime is 11320212212021. The reversal of 11320212211981 is 18911221202311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8645122987081 + 2675089224900 = 2940259^2 + 1635570^2 .

It is a cyclic number.

It is not a de Polignac number, because 11320212211981 - 2³⁵ = 11285852473613 is a prime.

It is a super-2 number, since 2×11320212211981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11320212211921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5660106105990 + 5660106105991.

It is an arithmetic number, because the mean of its divisors is an integer number (5660106105991).

Almost surely, 2^{11320212211981} is an apocalyptic number.

It is an amenable number.

11320212211981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11320212211981 is an equidigital number, since it uses as much as digits as its factorization.

11320212211981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 34.

The spelling of 11320212211981 in words is "eleven trillion, three hundred twenty billion, two hundred twelve million, two hundred eleven thousand, nine hundred eighty-one".