2012111021221 has 12 divisors (see below), whose sum is σ = 2341191314880. Its totient is φ = 1724244842040.

The previous prime is 2012111021191. The next prime is 2012111021293. The reversal of 2012111021221 is 1221201112102.

It is not a de Polignac number, because 2012111021221 - 2⁵ = 2012111021189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012111021195 and 2012111021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012111022221) 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, 4818301 + ... + 5219218.

It is an arithmetic number, because the mean of its divisors is an integer number (195099276240).

Almost surely, 2^{2012111021221} is an apocalyptic number.

It is an amenable number.

2012111021221 is a deficient number, since it is larger than the sum of its proper divisors (329080293659).

2012111021221 is a wasteful number, since it uses less digits than its factorization.

2012111021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10041624 (or 10041617 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2012111021221 its reverse (1221201112102), we get a palindrome (3233312133323).

The spelling of 2012111021221 in words is "two trillion, twelve billion, one hundred eleven million, twenty-one thousand, two hundred twenty-one".