202220112121 has 4 divisors (see below), whose sum is σ = 214115412852. Its totient is φ = 190324811392.

The previous prime is 202220112037. The next prime is 202220112139. The reversal of 202220112121 is 121211022202.

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: 121211022202 = 2 ⋅60605511101.

It can be written as a sum of positive squares in 2 ways, for example, as 71201450896 + 131018661225 = 266836^2 + 361965^2 .

It is a cyclic number.

It is not a de Polignac number, because 202220112121 - 2²⁹ = 201683241209 is a prime.

It is a super-2 number, since 2×202220112121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202220112095 and 202220112104.

It is not an unprimeable number, because it can be changed into a prime (202220115121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5947650340 + ... + 5947650373.

It is an arithmetic number, because the mean of its divisors is an integer number (53528853213).

Almost surely, 2^202220112121 is an apocalyptic number.

It is an amenable number.

202220112121 is a deficient number, since it is larger than the sum of its proper divisors (11895300731).

202220112121 is a wasteful number, since it uses less digits than its factorization.

202220112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11895300730.

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

Adding to 202220112121 its reverse (121211022202), we get a palindrome (323431134323).

The spelling of 202220112121 in words is "two hundred two billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-one".