221401104121 has 2 divisors, whose sum is σ = 221401104122. Its totient is φ = 221401104120.

The previous prime is 221401104109. The next prime is 221401104143. The reversal of 221401104121 is 121401104122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171955355625 + 49445748496 = 414675^2 + 222364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221401104121 is a prime.

It is not a weakly prime, because it can be changed into another prime (221401101121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110700552060 + 110700552061.

It is an arithmetic number, because the mean of its divisors is an integer number (110700552061).

Almost surely, 2^221401104121 is an apocalyptic number.

It is an amenable number.

221401104121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221401104121 is an equidigital number, since it uses as much as digits as its factorization.

221401104121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221401104121 its reverse (121401104122), we get a palindrome (342802208243).

Subtracting from 221401104121 its reverse (121401104122), we obtain a palindrome (99999999999).

The spelling of 221401104121 in words is "two hundred twenty-one billion, four hundred one million, one hundred four thousand, one hundred twenty-one".