2012111021 has 4 divisors (see below), whose sum is σ = 2034719100. Its totient is φ = 1989502944.

The previous prime is 2012110999. The next prime is 2012111029. The reversal of 2012111021 is 1201112102.

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 478996996 + 1533114025 = 21886^2 + 39155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2012111021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012110993 and 2012111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012111029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11303906 + ... + 11304083.

It is an arithmetic number, because the mean of its divisors is an integer number (508679775).

Almost surely, 2^2012111021 is an apocalyptic number.

It is an amenable number.

2012111021 is a deficient number, since it is larger than the sum of its proper divisors (22608079).

2012111021 is an equidigital number, since it uses as much as digits as its factorization.

2012111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22608078.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2012111021 is about 44856.5605123710. The cubic root of 2012111021 is about 1262.4590887766.

Adding to 2012111021 its reverse (1201112102), we get a palindrome (3213223123).

The spelling of 2012111021 in words is "two billion, twelve million, one hundred eleven thousand, twenty-one".