12011112222521 has 2 divisors, whose sum is σ = 12011112222522. Its totient is φ = 12011112222520.

The previous prime is 12011112222509. The next prime is 12011112222539. The reversal of 12011112222521 is 12522221111021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9460268820025 + 2550843402496 = 3075755^2 + 1597136^2 .

It is an emirp because it is prime and its reverse (12522221111021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12011112222521 - 2¹⁰ = 12011112221497 is a prime.

It is not a weakly prime, because it can be changed into another prime (12011112225521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005556111260 + 6005556111261.

It is an arithmetic number, because the mean of its divisors is an integer number (6005556111261).

Almost surely, 2^{12011112222521} is an apocalyptic number.

It is an amenable number.

12011112222521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011112222521 is an equidigital number, since it uses as much as digits as its factorization.

12011112222521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 12011112222521 its reverse (12522221111021), we get a palindrome (24533333333542).

The spelling of 12011112222521 in words is "twelve trillion, eleven billion, one hundred twelve million, two hundred twenty-two thousand, five hundred twenty-one".