2022121021 has 4 divisors (see below), whose sum is σ = 2040672700. Its totient is φ = 2003569344.

The previous prime is 2022121001. The next prime is 2022121027. The reversal of 2022121021 is 1201212202.

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: 1201212202 = 2 ⋅600606101.

It can be written as a sum of positive squares in 2 ways, for example, as 1137712900 + 884408121 = 33730^2 + 29739^2 .

It is a cyclic number.

It is not a de Polignac number, because 2022121021 - 2²⁷ = 1887903293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2022120992 and 2022121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2022121027) 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, 9275676 + ... + 9275893.

It is an arithmetic number, because the mean of its divisors is an integer number (510168175).

Almost surely, 2^2022121021 is an apocalyptic number.

It is an amenable number.

2022121021 is a deficient number, since it is larger than the sum of its proper divisors (18551679).

2022121021 is a wasteful number, since it uses less digits than its factorization.

2022121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18551678.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2022121021 is about 44967.9999666429. Note that the first 4 decimals coincide. The cubic root of 2022121021 is about 1264.5491518807.

Adding to 2022121021 its reverse (1201212202), we get a palindrome (3223333223).

The spelling of 2022121021 in words is "two billion, twenty-two million, one hundred twenty-one thousand, twenty-one".