2112121022021 has 4 divisors (see below), whose sum is σ = 2112124793472. Its totient is φ = 2112117250572.

The previous prime is 2112121021979. The next prime is 2112121022051. The reversal of 2112121022021 is 1202201212112.

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 not a de Polignac number, because 2112121022021 - 2³⁰ = 2111047280197 is a prime.

It is a super-2 number, since 2×2112121022021² (a number of 25 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 (2112121022051) 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, 859535 + ... + 2227788.

It is an arithmetic number, because the mean of its divisors is an integer number (528031198368).

Almost surely, 2^{2112121022021} is an apocalyptic number.

It is an amenable number.

2112121022021 is a deficient number, since it is larger than the sum of its proper divisors (3771451).

2112121022021 is an equidigital number, since it uses as much as digits as its factorization.

2112121022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3771450.

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

Adding to 2112121022021 its reverse (1202201212112), we get a palindrome (3314322234133).

The spelling of 2112121022021 in words is "two trillion, one hundred twelve billion, one hundred twenty-one million, twenty-two thousand, twenty-one".