2012000021 has 8 divisors (see below), whose sum is σ = 2016837144. Its totient is φ = 2007170560.

The previous prime is 2012000009. The next prime is 2012000033. The reversal of 2012000021 is 1200002102.

It is an interprime number because it is at equal distance from previous prime (2012000009) and next prime (2012000033).

It can be written as a sum of positive squares in 4 ways, for example, as 172791025 + 1839208996 = 13145^2 + 42886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2012000021 - 2¹⁰ = 2011998997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011999972 and 2012000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012000051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1294781 + ... + 1296333.

It is an arithmetic number, because the mean of its divisors is an integer number (252104643).

Almost surely, 2^2012000021 is an apocalyptic number.

It is an amenable number.

2012000021 is a deficient number, since it is larger than the sum of its proper divisors (4837123).

2012000021 is a wasteful number, since it uses less digits than its factorization.

2012000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831.

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

The square root of 2012000021 is about 44855.3232180975. The cubic root of 2012000021 is about 1262.4358734347.

Adding to 2012000021 its reverse (1200002102), we get a palindrome (3212002123).

The spelling of 2012000021 in words is "two billion, twelve million, twenty-one", and thus it is an aban number and an uban number.