221011123431121 has 2 divisors, whose sum is σ = 221011123431122. Its totient is φ = 221011123431120.

The previous prime is 221011123431103. The next prime is 221011123431187. The reversal of 221011123431121 is 121134321110122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117875643273025 + 103135480158096 = 10857055^2 + 10155564^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011123431121 - 2²¹ = 221011121333969 is a prime.

It is not a weakly prime, because it can be changed into another prime (221011123431521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505561715560 + 110505561715561.

It is an arithmetic number, because the mean of its divisors is an integer number (110505561715561).

Almost surely, 2^{221011123431121} is an apocalyptic number.

It is an amenable number.

221011123431121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011123431121 is an equidigital number, since it uses as much as digits as its factorization.

221011123431121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 221011123431121 its reverse (121134321110122), we get a palindrome (342145444541243).

The spelling of 221011123431121 in words is "two hundred twenty-one trillion, eleven billion, one hundred twenty-three million, four hundred thirty-one thousand, one hundred twenty-one".