221110110112121 has 4 divisors (see below), whose sum is σ = 221110266080100. Its totient is φ = 221109954144144.

The previous prime is 221110110112057. The next prime is 221110110112153. The reversal of 221110110112121 is 121211011011122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 171718380306496 + 49391729805625 = 13104136^2 + 7027925^2 .

It is a cyclic number.

It is not a de Polignac number, because 221110110112121 - 2⁶ = 221110110112057 is a prime.

It is a super-2 number, since 2×221110110112121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221110110112121.

It is not an unprimeable number, because it can be changed into a prime (221110110102121) 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 in 3 ways as a sum of consecutive naturals, for example, 75837806 + ... + 78699383.

It is an arithmetic number, because the mean of its divisors is an integer number (55277566520025).

Almost surely, 2^{221110110112121} is an apocalyptic number.

It is an amenable number.

221110110112121 is a deficient number, since it is larger than the sum of its proper divisors (155967979).

221110110112121 is a wasteful number, since it uses less digits than its factorization.

221110110112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155967978.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 221110110112121 its reverse (121211011011122), we get a palindrome (342321121123243).

The spelling of 221110110112121 in words is "two hundred twenty-one trillion, one hundred ten billion, one hundred ten million, one hundred twelve thousand, one hundred twenty-one".