221101222021221 has 4 divisors (see below), whose sum is σ = 294801629361632. Its totient is φ = 147400814680812.

The previous prime is 221101222021189. The next prime is 221101222021259. The reversal of 221101222021221 is 122120222101122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221101222021221 - 2⁵ = 221101222021189 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 (221101222021291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36850203670201 + ... + 36850203670206.

It is an arithmetic number, because the mean of its divisors is an integer number (73700407340408).

Almost surely, 2^{221101222021221} is an apocalyptic number.

It is an amenable number.

221101222021221 is a deficient number, since it is larger than the sum of its proper divisors (73700407340411).

221101222021221 is an equidigital number, since it uses as much as digits as its factorization.

221101222021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73700407340410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221101222021221 its reverse (122120222101122), we get a palindrome (343221444122343).

The spelling of 221101222021221 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".