221101211221 has 8 divisors (see below), whose sum is σ = 242236522944. Its totient is φ = 200138433120.

The previous prime is 221101211189. The next prime is 221101211249. The reversal of 221101211221 is 122112101122.

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 221101211221 - 2⁵ = 221101211189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221101211195 and 221101211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101211291) 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, 43130721 + ... + 43135846.

It is an arithmetic number, because the mean of its divisors is an integer number (30279565368).

Almost surely, 2^221101211221 is an apocalyptic number.

It is an amenable number.

221101211221 is a deficient number, since it is larger than the sum of its proper divisors (21135311723).

221101211221 is a wasteful number, since it uses less digits than its factorization.

221101211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86266811.

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

Adding to 221101211221 its reverse (122112101122), we get a palindrome (343213312343).

The spelling of 221101211221 in words is "two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, two hundred twenty-one".