221321031121 has 8 divisors (see below), whose sum is σ = 231079814784. Its totient is φ = 211573591680.

The previous prime is 221321031109. The next prime is 221321031161. The reversal of 221321031121 is 121130123122.

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 221321031121 - 2¹¹ = 221321029073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221321031161) 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, 2796165 + ... + 2874226.

It is an arithmetic number, because the mean of its divisors is an integer number (28884976848).

Almost surely, 2^221321031121 is an apocalyptic number.

It is an amenable number.

221321031121 is a deficient number, since it is larger than the sum of its proper divisors (9758783663).

221321031121 is a wasteful number, since it uses less digits than its factorization.

221321031121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672111.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221321031121 its reverse (121130123122), we get a palindrome (342451154243).

The spelling of 221321031121 in words is "two hundred twenty-one billion, three hundred twenty-one million, thirty-one thousand, one hundred twenty-one".