2012121222221 has 8 divisors (see below), whose sum is σ = 2310569824800. Its totient is φ = 1732927368240.

The previous prime is 2012121222197. The next prime is 2012121222229. The reversal of 2012121222221 is 1222221212102.

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 2012121222221 - 2³⁸ = 1737243315277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012121222193 and 2012121222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012121222229) 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, 4813686926 + ... + 4813687343.

It is an arithmetic number, because the mean of its divisors is an integer number (288821228100).

Almost surely, 2^{2012121222221} is an apocalyptic number.

It is an amenable number.

2012121222221 is a deficient number, since it is larger than the sum of its proper divisors (298448602579).

2012121222221 is a wasteful number, since it uses less digits than its factorization.

2012121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9627374299.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2012121222221 its reverse (1222221212102), we get a palindrome (3234342434323).

The spelling of 2012121222221 in words is "two trillion, twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".