12122202120021 has 24 divisors (see below), whose sum is σ = 20437025666304. Its totient is φ = 6779590241760.

The previous prime is 12122202120013. The next prime is 12122202120023. The reversal of 12122202120021 is 12002120222121.

It is a happy number.

12122202120021 is a `hidden beast` number, since 1 + 212 + 220 + 212 + 0 + 0 + 21 = 666.

It is not a de Polignac number, because 12122202120021 - 2³ = 12122202120013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12122202119976 and 12122202120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122202120023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2046974770 + ... + 2046980691.

It is an arithmetic number, because the mean of its divisors is an integer number (851542736096).

Almost surely, 2^{12122202120021} is an apocalyptic number.

It is an amenable number.

12122202120021 is a deficient number, since it is larger than the sum of its proper divisors (8314823546283).

12122202120021 is a wasteful number, since it uses less digits than its factorization.

12122202120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093955521 (or 4093955518 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12122202120021 its reverse (12002120222121), we get a palindrome (24124322342142).

The spelling of 12122202120021 in words is "twelve trillion, one hundred twenty-two billion, two hundred two million, one hundred twenty thousand, twenty-one".