221102010121 has 2 divisors, whose sum is σ = 221102010122. Its totient is φ = 221102010120.

The previous prime is 221102010049. The next prime is 221102010131. The reversal of 221102010121 is 121010201122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209705380096 + 11396630025 = 457936^2 + 106755^2 .

It is a cyclic number.

It is not a de Polignac number, because 221102010121 - 2¹³ = 221102001929 is a prime.

It is not a weakly prime, because it can be changed into another prime (221102010131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551005060 + 110551005061.

It is an arithmetic number, because the mean of its divisors is an integer number (110551005061).

Almost surely, 2^221102010121 is an apocalyptic number.

It is an amenable number.

221102010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221102010121 is an equidigital number, since it uses as much as digits as its factorization.

221102010121 is an evil number, because the sum of its binary digits is even.

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

Adding to 221102010121 its reverse (121010201122), we get a palindrome (342112211243).

The spelling of 221102010121 in words is "two hundred twenty-one billion, one hundred two million, ten thousand, one hundred twenty-one".