201122110211221 has 4 divisors (see below), whose sum is σ = 202164193684012. Its totient is φ = 200080026738432.

The previous prime is 201122110211149. The next prime is 201122110211263. The reversal of 201122110211221 is 122112011221102.

It is a happy number.

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 27475314056100 + 173646796155121 = 5241690^2 + 13177511^2 .

It is a cyclic number.

It is not a de Polignac number, because 201122110211221 - 2¹⁵ = 201122110178453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201122110281221) 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, 521041736106 + ... + 521041736491.

It is an arithmetic number, because the mean of its divisors is an integer number (50541048421003).

Almost surely, 2^{201122110211221} is an apocalyptic number.

It is an amenable number.

201122110211221 is a deficient number, since it is larger than the sum of its proper divisors (1042083472791).

201122110211221 is a wasteful number, since it uses less digits than its factorization.

201122110211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042083472790.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201122110211221 its reverse (122112011221102), we get a palindrome (323234121432323).

The spelling of 201122110211221 in words is "two hundred one trillion, one hundred twenty-two billion, one hundred ten million, two hundred eleven thousand, two hundred twenty-one".