2112021013 has 4 divisors (see below), whose sum is σ = 2169102700. Its totient is φ = 2054939328.

The previous prime is 2112021001. The next prime is 2112021031. The reversal of 2112021013 is 3101202112.

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 1528653604 + 583367409 = 39098^2 + 24153^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112021013 - 2²¹ = 2109923861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112020984 and 2112021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112021073) 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, 28540788 + ... + 28540861.

It is an arithmetic number, because the mean of its divisors is an integer number (542275675).

Almost surely, 2^2112021013 is an apocalyptic number.

It is an amenable number.

2112021013 is a deficient number, since it is larger than the sum of its proper divisors (57081687).

2112021013 is an equidigital number, since it uses as much as digits as its factorization.

2112021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57081686.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2112021013 is about 45956.7297900971. The cubic root of 2112021013 is about 1283.0179870296.

Adding to 2112021013 its reverse (3101202112), we get a palindrome (5213223125).

The spelling of 2112021013 in words is "two billion, one hundred twelve million, twenty-one thousand, thirteen".