2012221230021 has 16 divisors (see below), whose sum is σ = 2981895100800. Its totient is φ = 1341108844704.

The previous prime is 2012221230017. The next prime is 2012221230079. The reversal of 2012221230021 is 1200321222102.

It is not a de Polignac number, because 2012221230021 - 2² = 2012221230017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2012221229976 and 2012221230003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012221234021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10233456 + ... + 10428233.

It is an arithmetic number, because the mean of its divisors is an integer number (186368443800).

Almost surely, 2^{2012221230021} is an apocalyptic number.

It is an amenable number.

2012221230021 is a deficient number, since it is larger than the sum of its proper divisors (969673870779).

2012221230021 is a wasteful number, since it uses less digits than its factorization.

2012221230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20665305 (or 20665299 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 2012221230021 its reverse (1200321222102), we get a palindrome (3212542452123).

The spelling of 2012221230021 in words is "two trillion, twelve billion, two hundred twenty-one million, two hundred thirty thousand, twenty-one".