2112020021 has 4 divisors (see below), whose sum is σ = 2114902092. Its totient is φ = 2109137952.

The previous prime is 2112019981. The next prime is 2112020077. The reversal of 2112020021 is 1200202112.

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 1999341796 + 112678225 = 44714^2 + 10615^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112020021 - 2⁶ = 2112019957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112019984 and 2112020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112020081) 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, 1439936 + ... + 1441401.

It is an arithmetic number, because the mean of its divisors is an integer number (528725523).

Almost surely, 2^2112020021 is an apocalyptic number.

It is an amenable number.

2112020021 is a deficient number, since it is larger than the sum of its proper divisors (2882071).

2112020021 is an equidigital number, since it uses as much as digits as its factorization.

2112020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882070.

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

The square root of 2112020021 is about 45956.7189973349. The cubic root of 2112020021 is about 1283.0177861550.

Adding to 2112020021 its reverse (1200202112), we get a palindrome (3312222133).

The spelling of 2112020021 in words is "two billion, one hundred twelve million, twenty thousand, twenty-one".