2112121112021 has 4 divisors (see below), whose sum is σ = 2112272391552. Its totient is φ = 2111969832492.

The previous prime is 2112121112011. The next prime is 2112121112029. The reversal of 2112121112021 is 1202111212112.

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 2112121112021 - 2⁶ = 2112121111957 is a prime.

It is a super-2 number, since 2×2112121112021² (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 (2112121112029) 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, 75618821 + ... + 75646746.

It is an arithmetic number, because the mean of its divisors is an integer number (528068097888).

Almost surely, 2^{2112121112021} is an apocalyptic number.

It is an amenable number.

2112121112021 is a deficient number, since it is larger than the sum of its proper divisors (151279531).

2112121112021 is a wasteful number, since it uses less digits than its factorization.

2112121112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151279530.

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

Adding to 2112121112021 its reverse (1202111212112), we get a palindrome (3314232324133).

The spelling of 2112121112021 in words is "two trillion, one hundred twelve billion, one hundred twenty-one million, one hundred twelve thousand, twenty-one".