221111212220201 has 8 divisors (see below), whose sum is σ = 221338944563880. Its totient is φ = 220883506348032.

The previous prime is 221111212220167. The next prime is 221111212220317. The reversal of 221111212220201 is 102022212111122.

221111212220201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 163169353298176 + 57941858922025 = 12773776^2 + 7611955^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221111212220201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221111212220501) 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, 10118105 + ... + 23336633.

It is an arithmetic number, because the mean of its divisors is an integer number (27667368070485).

Almost surely, 2^{221111212220201} is an apocalyptic number.

It is an amenable number.

221111212220201 is a deficient number, since it is larger than the sum of its proper divisors (227732343679).

221111212220201 is a wasteful number, since it uses less digits than its factorization.

221111212220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13235755.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221111212220201 its reverse (102022212111122), we get a palindrome (323133424331323).

The spelling of 221111212220201 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twelve million, two hundred twenty thousand, two hundred one".