221110112122221 has 16 divisors (see below), whose sum is σ = 336932533833728. Its totient is φ = 126347570809200.

The previous prime is 221110112122201. The next prime is 221110112122241. The reversal of 221110112122221 is 122221211011122.

221110112122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221110112122201) and next prime (221110112122241).

It is not a de Polignac number, because 221110112122221 - 2⁹ = 221110112121709 is a prime.

It is a super-2 number, since 2×221110112122221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221110112122201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41807185 + ... + 46798086.

It is an arithmetic number, because the mean of its divisors is an integer number (21058283364608).

Almost surely, 2^{221110112122221} is an apocalyptic number.

221110112122221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221110112122221 is a deficient number, since it is larger than the sum of its proper divisors (115822421711507).

221110112122221 is a wasteful number, since it uses less digits than its factorization.

221110112122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88724112.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221110112122221 its reverse (122221211011122), we get a palindrome (343331323133343).

The spelling of 221110112122221 in words is "two hundred twenty-one trillion, one hundred ten billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".