12121111022021 has 4 divisors (see below), whose sum is σ = 12150746990700. Its totient is φ = 12091475053344.

The previous prime is 12121111021967. The next prime is 12121111022051. The reversal of 12121111022021 is 12022011112121.

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 5433146089921 + 6687964932100 = 2330911^2 + 2586110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121111022021 is a prime.

It is a super-2 number, since 2×12121111022021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121111022051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14817983726 + ... + 14817984543.

It is an arithmetic number, because the mean of its divisors is an integer number (3037686747675).

Almost surely, 2^{12121111022021} is an apocalyptic number.

It is an amenable number.

12121111022021 is a deficient number, since it is larger than the sum of its proper divisors (29635968679).

12121111022021 is an equidigital number, since it uses as much as digits as its factorization.

12121111022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29635968678.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12121111022021 its reverse (12022011112121), we get a palindrome (24143122134142).

The spelling of 12121111022021 in words is "twelve trillion, one hundred twenty-one billion, one hundred eleven million, twenty-two thousand, twenty-one".