221101121221 has 8 divisors (see below), whose sum is σ = 230795604864. Its totient is φ = 211413420240.

The previous prime is 221101121209. The next prime is 221101121231. The reversal of 221101121221 is 122121101122.

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 221101121221 - 2¹³ = 221101113029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221101121195 and 221101121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1628985 + ... + 1759486.

It is an arithmetic number, because the mean of its divisors is an integer number (28849450608).

Almost surely, 2^221101121221 is an apocalyptic number.

It is an amenable number.

221101121221 is a deficient number, since it is larger than the sum of its proper divisors (9694483643).

221101121221 is a wasteful number, since it uses less digits than its factorization.

221101121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391331.

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

Adding to 221101121221 its reverse (122121101122), we get a palindrome (343222222343).

The spelling of 221101121221 in words is "two hundred twenty-one billion, one hundred one million, one hundred twenty-one thousand, two hundred twenty-one".