12122200121021 has 4 divisors (see below), whose sum is σ = 12129162902844. Its totient is φ = 12115237339200.

The previous prime is 12122200120999. The next prime is 12122200121041. The reversal of 12122200121021 is 12012100222121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1221710196100 + 10900489924921 = 1105310^2 + 3301589^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122200121021 - 2⁴² = 7724153609917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122200121041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3481388300 + ... + 3481391781.

It is an arithmetic number, because the mean of its divisors is an integer number (3032290725711).

Almost surely, 2^{12122200121021} is an apocalyptic number.

It is an amenable number.

12122200121021 is a deficient number, since it is larger than the sum of its proper divisors (6962781823).

12122200121021 is an equidigital number, since it uses as much as digits as its factorization.

12122200121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6962781822.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12122200121021 its reverse (12012100222121), we get a palindrome (24134300343142).

The spelling of 12122200121021 in words is "twelve trillion, one hundred twenty-two billion, two hundred million, one hundred twenty-one thousand, twenty-one".