221110101021221 has 8 divisors (see below), whose sum is σ = 232749822208320. Its totient is φ = 209470614579072.

The previous prime is 221110101021181. The next prime is 221110101021289. The reversal of 221110101021221 is 122120101011122.

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 221110101021221 - 2⁶ = 221110101021157 is a prime.

It is a super-2 number, since 2×221110101021221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221110101021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221110101029221) 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, 56751185 + ... + 60522038.

It is an arithmetic number, because the mean of its divisors is an integer number (29093727776040).

Almost surely, 2^{221110101021221} is an apocalyptic number.

It is an amenable number.

221110101021221 is a deficient number, since it is larger than the sum of its proper divisors (11639721187099).

221110101021221 is a wasteful number, since it uses less digits than its factorization.

221110101021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117372475.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221110101021221 its reverse (122120101011122), we get a palindrome (343230202032343).

The spelling of 221110101021221 in words is "two hundred twenty-one trillion, one hundred ten billion, one hundred one million, twenty-one thousand, two hundred twenty-one".