221111121220201 has 4 divisors (see below), whose sum is σ = 221319520016004. Its totient is φ = 220902722424400.

The previous prime is 221111121220181. The next prime is 221111121220207. The reversal of 221111121220201 is 102022121111122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124766688349801 + 96344432870400 = 11169901^2 + 9815520^2 .

It is a cyclic number.

It is not a de Polignac number, because 221111121220201 - 2⁹ = 221111121219689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221111121220207) 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, 104199396310 + ... + 104199398431.

It is an arithmetic number, because the mean of its divisors is an integer number (55329880004001).

Almost surely, 2^{221111121220201} is an apocalyptic number.

It is an amenable number.

221111121220201 is a deficient number, since it is larger than the sum of its proper divisors (208398795803).

221111121220201 is a wasteful number, since it uses less digits than its factorization.

221111121220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208398795802.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221111121220201 its reverse (102022121111122), we get a palindrome (323133242331323).

The spelling of 221111121220201 in words is "two hundred twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, two hundred one".