202201122121 has 4 divisors (see below), whose sum is σ = 202681410244. Its totient is φ = 201720834000.

The previous prime is 202201122103. The next prime is 202201122131. The reversal of 202201122121 is 121221102202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121221102202 = 2 ⋅60610551101.

It can be written as a sum of positive squares in 2 ways, for example, as 10413182025 + 191787940096 = 102045^2 + 437936^2 .

It is a cyclic number.

It is not a de Polignac number, because 202201122121 - 2¹¹ = 202201120073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202201122095 and 202201122104.

It is not an unprimeable number, because it can be changed into a prime (202201122131) 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, 240143430 + ... + 240144271.

It is an arithmetic number, because the mean of its divisors is an integer number (50670352561).

Almost surely, 2^202201122121 is an apocalyptic number.

It is an amenable number.

202201122121 is a deficient number, since it is larger than the sum of its proper divisors (480288123).

202201122121 is an equidigital number, since it uses as much as digits as its factorization.

202201122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480288122.

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

Adding to 202201122121 its reverse (121221102202), we get a palindrome (323422224323).

The spelling of 202201122121 in words is "two hundred two billion, two hundred one million, one hundred twenty-two thousand, one hundred twenty-one".