221100102121 has 2 divisors, whose sum is σ = 221100102122. Its totient is φ = 221100102120.

The previous prime is 221100102071. The next prime is 221100102127. The reversal of 221100102121 is 121201001122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170895426025 + 50204676096 = 413395^2 + 224064^2 .

It is a cyclic number.

It is not a de Polignac number, because 221100102121 - 2⁹ = 221100101609 is a prime.

It is not a weakly prime, because it can be changed into another prime (221100102127) 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, 110550051060 + 110550051061.

It is an arithmetic number, because the mean of its divisors is an integer number (110550051061).

Almost surely, 2^221100102121 is an apocalyptic number.

It is an amenable number.

221100102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221100102121 is an equidigital number, since it uses as much as digits as its factorization.

221100102121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221100102121 its reverse (121201001122), we get a palindrome (342301103243).

The spelling of 221100102121 in words is "two hundred twenty-one billion, one hundred million, one hundred two thousand, one hundred twenty-one".