221010121 has 8 divisors (see below), whose sum is σ = 226206720. Its totient is φ = 215834208.

The previous prime is 221010113. The next prime is 221010133. The reversal of 221010121 is 121010122.

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

It is a cyclic number.

It is not a de Polignac number, because 221010121 - 2³ = 221010113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221010098 and 221010107.

It is not an unprimeable number, because it can be changed into a prime (221010161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17605 + ... + 27421.

It is an arithmetic number, because the mean of its divisors is an integer number (28275840).

Almost surely, 2^221010121 is an apocalyptic number.

It is an amenable number.

221010121 is a deficient number, since it is larger than the sum of its proper divisors (5196599).

221010121 is an equidigital number, since it uses as much as digits as its factorization.

221010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221010121 is about 14866.4091494887. The cubic root of 221010121 is about 604.6035888714.

Adding to 221010121 its reverse (121010122), we get a palindrome (342020243).

Subtracting from 221010121 its reverse (121010122), we obtain a palindrome (99999999).

It can be divided in two parts, 2210101 and 21, that added together give a palindrome (2210122).

The spelling of 221010121 in words is "two hundred twenty-one million, ten thousand, one hundred twenty-one".