221201123 has 8 divisors (see below), whose sum is σ = 259872816. Its totient is φ = 185623200.

The previous prime is 221201117. The next prime is 221201131. The reversal of 221201123 is 321102122.

It is a happy number.

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 221201123 - 2²⁶ = 154092259 is a prime.

It is a super-2 number, since 2×221201123² = 97859873632922258, 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 = 221201098 and 221201107.

It is not an unprimeable number, because it can be changed into a prime (221201153) 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, 773288 + ... + 773573.

It is an arithmetic number, because the mean of its divisors is an integer number (32484102).

Almost surely, 2^221201123 is an apocalyptic number.

221201123 is a deficient number, since it is larger than the sum of its proper divisors (38671693).

221201123 is a wasteful number, since it uses less digits than its factorization.

221201123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546885.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221201123 is about 14872.8317075129. The cubic root of 221201123 is about 604.7777094700. Note that the first 4 decimals are identical.

Adding to 221201123 its reverse (321102122), we get a palindrome (542303245).

Subtracting 221201123 from its reverse (321102122), we obtain a palindrome (99900999).

The spelling of 221201123 in words is "two hundred twenty-one million, two hundred one thousand, one hundred twenty-three".