221011121221 has 8 divisors (see below), whose sum is σ = 241109589600. Its totient is φ = 200913744240.

The previous prime is 221011121183. The next prime is 221011121249. The reversal of 221011121221 is 122121110122.

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

It is not a de Polignac number, because 221011121221 - 2⁹ = 221011120709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221011121195 and 221011121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183810 + ... + 689788.

It is an arithmetic number, because the mean of its divisors is an integer number (30138698700).

Almost surely, 2^221011121221 is an apocalyptic number.

It is an amenable number.

221011121221 is a deficient number, since it is larger than the sum of its proper divisors (20098468379).

221011121221 is a wasteful number, since it uses less digits than its factorization.

221011121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545699.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221011121221 its reverse (122121110122), we get a palindrome (343132231343).

The spelling of 221011121221 in words is "two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, two hundred twenty-one".