201223011221 has 4 divisors (see below), whose sum is σ = 201295474572. Its totient is φ = 201150547872.

The previous prime is 201223011211. The next prime is 201223011247. The reversal of 201223011221 is 122110322102.

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 47256238225 + 153966772996 = 217385^2 + 392386^2 .

It is a cyclic number.

It is not a de Polignac number, because 201223011221 - 2²⁶ = 201155902357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201223011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201223011211) 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, 36227510 + ... + 36233063.

It is an arithmetic number, because the mean of its divisors is an integer number (50323868643).

Almost surely, 2^201223011221 is an apocalyptic number.

It is an amenable number.

201223011221 is a deficient number, since it is larger than the sum of its proper divisors (72463351).

201223011221 is an equidigital number, since it uses as much as digits as its factorization.

201223011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72463350.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 201223011221 its reverse (122110322102), we get a palindrome (323333333323).

The spelling of 201223011221 in words is "two hundred one billion, two hundred twenty-three million, eleven thousand, two hundred twenty-one".