12122111222021 has 4 divisors (see below), whose sum is σ = 12380028482112. Its totient is φ = 11864193961932.

The previous prime is 12122111222009. The next prime is 12122111222041. The reversal of 12122111222021 is 12022211122121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12122111222021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12122111221984 and 12122111222002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122111222041) 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, 128958629975 + ... + 128958630068.

It is an arithmetic number, because the mean of its divisors is an integer number (3095007120528).

Almost surely, 2^{12122111222021} is an apocalyptic number.

It is an amenable number.

12122111222021 is a deficient number, since it is larger than the sum of its proper divisors (257917260091).

12122111222021 is an equidigital number, since it uses as much as digits as its factorization.

12122111222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257917260090.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12122111222021 its reverse (12022211122121), we get a palindrome (24144322344142).

The spelling of 12122111222021 in words is "twelve trillion, one hundred twenty-two billion, one hundred eleven million, two hundred twenty-two thousand, twenty-one".