12111012021221 has 2 divisors, whose sum is σ = 12111012021222. Its totient is φ = 12111012021220.

The previous prime is 12111012021209. The next prime is 12111012021253. The reversal of 12111012021221 is 12212021011121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7982743890625 + 4128268130596 = 2825375^2 + 2031814^2 .

It is an emirp because it is prime and its reverse (12212021011121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12111012021221 - 2²⁶ = 12110944912357 is a prime.

It is a super-2 number, since 2×12111012021221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12111012021221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111012921221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055506010610 + 6055506010611.

It is an arithmetic number, because the mean of its divisors is an integer number (6055506010611).

Almost surely, 2^{12111012021221} is an apocalyptic number.

It is an amenable number.

12111012021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111012021221 is an equidigital number, since it uses as much as digits as its factorization.

12111012021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12111012021221 its reverse (12212021011121), we get a palindrome (24323033032342).

The spelling of 12111012021221 in words is "twelve trillion, one hundred eleven billion, twelve million, twenty-one thousand, two hundred twenty-one".