2112001121021 has 4 divisors (see below), whose sum is σ = 2304001222944. Its totient is φ = 1920001019100.

The previous prime is 2112001121011. The next prime is 2112001121029. The reversal of 2112001121021 is 1201211002112.

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-2112001121021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2112001120987 and 2112001121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112001121029) 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, 96000050945 + ... + 96000050966.

It is an arithmetic number, because the mean of its divisors is an integer number (576000305736).

Almost surely, 2^{2112001121021} is an apocalyptic number.

It is an amenable number.

2112001121021 is a deficient number, since it is larger than the sum of its proper divisors (192000101923).

2112001121021 is a wasteful number, since it uses less digits than its factorization.

2112001121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192000101922.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2112001121021 its reverse (1201211002112), we get a palindrome (3313212123133).

The spelling of 2112001121021 in words is "two trillion, one hundred twelve billion, one million, one hundred twenty-one thousand, twenty-one".