221201012221 has 4 divisors (see below), whose sum is σ = 252801156832. Its totient is φ = 189600867612.

The previous prime is 221201012209. The next prime is 221201012231. The reversal of 221201012221 is 122210102122.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 221201012221 - 2⁷ = 221201012093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221201012195 and 221201012204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201012231) 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, 15800072295 + ... + 15800072308.

It is an arithmetic number, because the mean of its divisors is an integer number (63200289208).

Almost surely, 2^221201012221 is an apocalyptic number.

It is an amenable number.

221201012221 is a deficient number, since it is larger than the sum of its proper divisors (31600144611).

221201012221 is an equidigital number, since it uses as much as digits as its factorization.

221201012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31600144610.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221201012221 its reverse (122210102122), we get a palindrome (343411114343).

The spelling of 221201012221 in words is "two hundred twenty-one billion, two hundred one million, twelve thousand, two hundred twenty-one".