221221123120201 has 4 divisors (see below), whose sum is σ = 221240581406100. Its totient is φ = 221201664834304.

The previous prime is 221221123120199. The next prime is 221221123120229. The reversal of 221221123120201 is 102021321122122.

221221123120201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 92932993310976 + 128288129809225 = 9640176^2 + 11326435^2 .

It is a cyclic number.

It is not a de Polignac number, because 221221123120201 - 2¹ = 221221123120199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221123120301) 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, 9729125896 + ... + 9729148633.

It is an arithmetic number, because the mean of its divisors is an integer number (55310145351525).

Almost surely, 2^{221221123120201} is an apocalyptic number.

It is an amenable number.

221221123120201 is a deficient number, since it is larger than the sum of its proper divisors (19458285899).

221221123120201 is a wasteful number, since it uses less digits than its factorization.

221221123120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19458285898.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 221221123120201 its reverse (102021321122122), we get a palindrome (323242444242323).

The spelling of 221221123120201 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty-three million, one hundred twenty thousand, two hundred one".