2012200021 has 12 divisors (see below), whose sum is σ = 2203389540. Its totient is φ = 1836531840.

The previous prime is 2012199989. The next prime is 2012200037. The reversal of 2012200021 is 1200022102.

It can be written as a sum of positive squares in 6 ways, for example, as 244922500 + 1767277521 = 15650^2 + 42039^2 .

It is not a de Polignac number, because 2012200021 - 2⁵ = 2012199989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012199980 and 2012200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012200321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51850 + ... + 81931.

It is an arithmetic number, because the mean of its divisors is an integer number (183615795).

Almost surely, 2^2012200021 is an apocalyptic number.

It is an amenable number.

2012200021 is a deficient number, since it is larger than the sum of its proper divisors (191189519).

2012200021 is a wasteful number, since it uses less digits than its factorization.

2012200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133896 (or 133883 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2012200021 is about 44857.5525524967. The cubic root of 2012200021 is about 1262.4777022628.

Adding to 2012200021 its reverse (1200022102), we get a palindrome (3212222123).

The spelling of 2012200021 in words is "two billion, twelve million, two hundred thousand, twenty-one".