201223101221 has 8 divisors (see below), whose sum is σ = 214236883224. Its totient is φ = 188340111360.

The previous prime is 201223101181. The next prime is 201223101229. The reversal of 201223101221 is 122101322102.

It can be written as a sum of positive squares in 4 ways, for example, as 4357848196 + 196865253025 = 66014^2 + 443695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-201223101221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 201223101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201223101229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32694860 + ... + 32701013.

It is an arithmetic number, because the mean of its divisors is an integer number (26779610403).

Almost surely, 2^201223101221 is an apocalyptic number.

It is an amenable number.

201223101221 is a deficient number, since it is larger than the sum of its proper divisors (13013782003).

201223101221 is a wasteful number, since it uses less digits than its factorization.

201223101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65396071.

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

Adding to 201223101221 its reverse (122101322102), we get a palindrome (323324423323).

The spelling of 201223101221 in words is "two hundred one billion, two hundred twenty-three million, one hundred one thousand, two hundred twenty-one".