2021212022121 has 32 divisors (see below), whose sum is σ = 3101852730240. Its totient is φ = 1316137999680.

The previous prime is 2021212022111. The next prime is 2021212022131. The reversal of 2021212022121 is 1212202121202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021212022111) and next prime (2021212022131).

It is not a de Polignac number, because 2021212022121 - 2²¹ = 2021209924969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021212022094 and 2021212022103.

It is not an unprimeable number, because it can be changed into a prime (2021212022111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10652400 + ... + 10840481.

It is an arithmetic number, because the mean of its divisors is an integer number (96932897820).

Almost surely, 2^{2021212022121} is an apocalyptic number.

It is an amenable number.

2021212022121 is a deficient number, since it is larger than the sum of its proper divisors (1080640708119).

2021212022121 is an frugal number, since it uses more digits than its factorization.

2021212022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21492945 (or 21492927 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2021212022121 its reverse (1212202121202), we get a palindrome (3233414143323).

The spelling of 2021212022121 in words is "two trillion, twenty-one billion, two hundred twelve million, twenty-two thousand, one hundred twenty-one".