221121122201 has 4 divisors (see below), whose sum is σ = 252709853952. Its totient is φ = 189532390452.

The previous prime is 221121122177. The next prime is 221121122203. The reversal of 221121122201 is 102221121122.

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, and also an emirpimes, since its reverse is a distinct semiprime: 102221121122 = 2 ⋅51110560561.

It is a cyclic number.

It is not a de Polignac number, because 221121122201 - 2⁶ = 221121122137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221121122201.

It is not an unprimeable number, because it can be changed into a prime (221121122203) 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 3 ways as a sum of consecutive naturals, for example, 15794365865 + ... + 15794365878.

It is an arithmetic number, because the mean of its divisors is an integer number (63177463488).

Almost surely, 2^221121122201 is an apocalyptic number.

It is an amenable number.

221121122201 is a deficient number, since it is larger than the sum of its proper divisors (31588731751).

221121122201 is an equidigital number, since it uses as much as digits as its factorization.

221121122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31588731750.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221121122201 its reverse (102221121122), we get a palindrome (323342243323).

The spelling of 221121122201 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred one".