221021112110121 has 12 divisors (see below), whose sum is σ = 336055492097520. Its totient is φ = 139592281332600.

The previous prime is 221021112110081. The next prime is 221021112110173. The reversal of 221021112110121 is 121011211120122.

It is a happy number.

221021112110121 is a `hidden beast` number, since 2 + 210 + 211 + 12 + 110 + 121 = 666.

It is not a de Polignac number, because 221021112110121 - 2¹¹ = 221021112108073 is a prime.

It is a super-2 number, since 2×221021112110121² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221021112110094 and 221021112110103.

It is not an unprimeable number, because it can be changed into a prime (221021112110321) 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, 646260561555 + ... + 646260561896.

It is an arithmetic number, because the mean of its divisors is an integer number (28004624341460).

Almost surely, 2^{221021112110121} is an apocalyptic number.

It is an amenable number.

221021112110121 is a deficient number, since it is larger than the sum of its proper divisors (115034379987399).

221021112110121 is a wasteful number, since it uses less digits than its factorization.

221021112110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292521123476 (or 1292521123473 counting only the distinct ones).

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

Adding to 221021112110121 its reverse (121011211120122), we get a palindrome (342032323230243).

The spelling of 221021112110121 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twelve million, one hundred ten thousand, one hundred twenty-one".