2122010021 has 4 divisors (see below), whose sum is σ = 2122440012. Its totient is φ = 2121580032.

The previous prime is 2122009999. The next prime is 2122010029. The reversal of 2122010021 is 1200102212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 382202500 + 1739807521 = 19550^2 + 41711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122010021 - 2¹⁸ = 2121747877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122009984 and 2122010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122010029) 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, 207506 + ... + 217491.

It is an arithmetic number, because the mean of its divisors is an integer number (530610003).

Almost surely, 2^2122010021 is an apocalyptic number.

It is an amenable number.

2122010021 is a deficient number, since it is larger than the sum of its proper divisors (429991).

2122010021 is an equidigital number, since it uses as much as digits as its factorization.

2122010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429990.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2122010021 is about 46065.2799948074. The cubic root of 2122010021 is about 1285.0375257907.

Adding to 2122010021 its reverse (1200102212), we get a palindrome (3322112233).

The spelling of 2122010021 in words is "two billion, one hundred twenty-two million, ten thousand, twenty-one".