221102121 has 8 divisors (see below), whose sum is σ = 302770624. Its totient is φ = 143417520.

The previous prime is 221102117. The next prime is 221102191. The reversal of 221102121 is 121201122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221102121 - 2² = 221102117 is a prime.

It is a super-2 number, since 2×221102121² = 97772295821397282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221102097 and 221102106.

It is not an unprimeable number, because it can be changed into a prime (221102191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 995845 + ... + 996066.

It is an arithmetic number, because the mean of its divisors is an integer number (37846328).

Almost surely, 2^221102121 is an apocalyptic number.

It is an amenable number.

221102121 is a deficient number, since it is larger than the sum of its proper divisors (81668503).

221102121 is a wasteful number, since it uses less digits than its factorization.

221102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991951.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 221102121 is about 14869.5030515482. The cubic root of 221102121 is about 604.6874701186.

Adding to 221102121 its reverse (121201122), we get a palindrome (342303243).

Subtracting from 221102121 its reverse (121201122), we obtain a palindrome (99900999).

The spelling of 221102121 in words is "two hundred twenty-one million, one hundred two thousand, one hundred twenty-one".