221110012121121 has 24 divisors (see below), whose sum is σ = 322507709062656. Its totient is φ = 145963866551040.

The previous prime is 221110012121099. The next prime is 221110012121147. The reversal of 221110012121121 is 121121210011122.

It is a happy number.

221110012121121 is a `hidden beast` number, since 2 + 211 + 100 + 121 + 211 + 21 = 666.

It is not a de Polignac number, because 221110012121121 - 2⁷ = 221110012120993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221110012121094 and 221110012121103.

It is not an unprimeable number, because it can be changed into a prime (221110012131121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2065201 + ... + 21130193.

It is an arithmetic number, because the mean of its divisors is an integer number (13437821210944).

Almost surely, 2^{221110012121121} is an apocalyptic number.

It is an amenable number.

221110012121121 is a deficient number, since it is larger than the sum of its proper divisors (101397696941535).

221110012121121 is a wasteful number, since it uses less digits than its factorization.

221110012121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19077613 (or 19077610 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221110012121121 its reverse (121121210011122), we get a palindrome (342231222132243).

The spelling of 221110012121121 in words is "two hundred twenty-one trillion, one hundred ten billion, twelve million, one hundred twenty-one thousand, one hundred twenty-one".