202121220122 has 16 divisors (see below), whose sum is σ = 303470142144. Its totient is φ = 100964556000.

The previous prime is 202121220121. The next prime is 202121220139. The reversal of 202121220122 is 221022121202.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 202121220122.

It is not an unprimeable number, because it can be changed into a prime (202121220121) 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, 9839222 + ... + 9859742.

It is an arithmetic number, because the mean of its divisors is an integer number (18966883884).

Almost surely, 2^202121220122 is an apocalyptic number.

202121220122 is a deficient number, since it is larger than the sum of its proper divisors (101348922022).

202121220122 is a wasteful number, since it uses less digits than its factorization.

202121220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24965.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202121220122 its reverse (221022121202), we get a palindrome (423143341324).

The spelling of 202121220122 in words is "two hundred two billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-two".