221111213121061 has 2 divisors, whose sum is σ = 221111213121062. Its totient is φ = 221111213121060.

The previous prime is 221111213121023. The next prime is 221111213121091. The reversal of 221111213121061 is 160121312111122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220928537232225 + 182675888836 = 14863665^2 + 427406^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111213121061 - 2⁹ = 221111213120549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221111213121091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555606560530 + 110555606560531.

It is an arithmetic number, because the mean of its divisors is an integer number (110555606560531).

Almost surely, 2^{221111213121061} is an apocalyptic number.

It is an amenable number.

221111213121061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111213121061 is an equidigital number, since it uses as much as digits as its factorization.

221111213121061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 25.

Adding to 221111213121061 its reverse (160121312111122), we get a palindrome (381232525232183).

The spelling of 221111213121061 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred thirteen million, one hundred twenty-one thousand, sixty-one".