202210212121 has 4 divisors (see below), whose sum is σ = 202238784000. Its totient is φ = 202181640244.

The previous prime is 202210212109. The next prime is 202210212151. The reversal of 202210212121 is 121212012202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202210212121 - 2⁷ = 202210211993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202210212095 and 202210212104.

It is not an unprimeable number, because it can be changed into a prime (202210212151) 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, 14275321 + ... + 14289478.

It is an arithmetic number, because the mean of its divisors is an integer number (50559696000).

Almost surely, 2^202210212121 is an apocalyptic number.

It is an amenable number.

202210212121 is a deficient number, since it is larger than the sum of its proper divisors (28571879).

202210212121 is an equidigital number, since it uses as much as digits as its factorization.

202210212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28571878.

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

Adding to 202210212121 its reverse (121212012202), we get a palindrome (323422224323).

The spelling of 202210212121 in words is "two hundred two billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-one".