221221120120121 has 12 divisors (see below), whose sum is σ = 245075053633536. Its totient is φ = 199526565019320.

The previous prime is 221221120120103. The next prime is 221221120120157. The reversal of 221221120120121 is 121021021122122.

It is not a de Polignac number, because 221221120120121 - 2³⁰ = 221220046378297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221221120120093 and 221221120120102.

It is not an unprimeable number, because it can be changed into a prime (221221120125121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7197912665 + ... + 7197943398.

It is an arithmetic number, because the mean of its divisors is an integer number (20422921136128).

Almost surely, 2^{221221120120121} is an apocalyptic number.

It is an amenable number.

221221120120121 is a deficient number, since it is larger than the sum of its proper divisors (23853933513415).

221221120120121 is a wasteful number, since it uses less digits than its factorization.

221221120120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14395856212 (or 14395856201 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221221120120121 its reverse (121021021122122), we get a palindrome (342242141242243).

The spelling of 221221120120121 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred twenty thousand, one hundred twenty-one".