12222121222021 has 4 divisors (see below), whose sum is σ = 12222128256544. Its totient is φ = 12222114187500.

The previous prime is 12222121221991. The next prime is 12222121222037. The reversal of 12222121222021 is 12022212122221.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12222121222021 - 2³¹ = 12219973738373 is a prime.

It is a super-2 number, since 2×12222121222021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12222121221983 and 12222121222001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222121222081) 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, 1179616 + ... + 5082886.

It is an arithmetic number, because the mean of its divisors is an integer number (3055532064136).

Almost surely, 2^{12222121222021} is an apocalyptic number.

It is an amenable number.

12222121222021 is a deficient number, since it is larger than the sum of its proper divisors (7034523).

12222121222021 is an equidigital number, since it uses as much as digits as its factorization.

12222121222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034522.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 12222121222021 its reverse (12022212122221), we get a palindrome (24244333344242).

The spelling of 12222121222021 in words is "twelve trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-one".