221211201 has 4 divisors (see below), whose sum is σ = 294948272. Its totient is φ = 147474132.

The previous prime is 221211163. The next prime is 221211203. The reversal of 221211201 is 102112122.

221211201 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221211201 - 2¹⁹ = 220686913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211203) 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, 36868531 + ... + 36868536.

It is an arithmetic number, because the mean of its divisors is an integer number (73737068).

Almost surely, 2^221211201 is an apocalyptic number.

It is an amenable number.

221211201 is a deficient number, since it is larger than the sum of its proper divisors (73737071).

221211201 is an equidigital number, since it uses as much as digits as its factorization.

221211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73737070.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 221211201 is about 14873.1705093433. The cubic root of 221211201 is about 604.7868939580.

Adding to 221211201 its reverse (102112122), we get a palindrome (323323323).

The spelling of 221211201 in words is "two hundred twenty-one million, two hundred eleven thousand, two hundred one".