221011331221 has 8 divisors (see below), whose sum is σ = 224976369024. Its totient is φ = 217069965840.

The previous prime is 221011331179. The next prime is 221011331263. The reversal of 221011331221 is 122133110122.

221011331221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221011331179) and next prime (221011331263).

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 221011331221 - 2²⁷ = 220877113493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011335221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5899266 + ... + 5936611.

It is an arithmetic number, because the mean of its divisors is an integer number (28122046128).

Almost surely, 2^221011331221 is an apocalyptic number.

It is an amenable number.

221011331221 is a deficient number, since it is larger than the sum of its proper divisors (3965037803).

221011331221 is a wasteful number, since it uses less digits than its factorization.

221011331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11836211.

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

Adding to 221011331221 its reverse (122133110122), we get a palindrome (343144441343).

The spelling of 221011331221 in words is "two hundred twenty-one billion, eleven million, three hundred thirty-one thousand, two hundred twenty-one".