2112001021 has 8 divisors (see below), whose sum is σ = 2277217880. Its totient is φ = 1947177792.

The previous prime is 2112001007. The next prime is 2112001043. The reversal of 2112001021 is 1201002112.

It can be written as a sum of positive squares in 4 ways, for example, as 22231225 + 2089769796 = 4715^2 + 45714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2112001021 - 2¹⁵ = 2111968253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112000989 and 2112001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112001121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87210 + ... + 108763.

It is an arithmetic number, because the mean of its divisors is an integer number (284652235).

Almost surely, 2^2112001021 is an apocalyptic number.

It is an amenable number.

2112001021 is a deficient number, since it is larger than the sum of its proper divisors (165216859).

2112001021 is a wasteful number, since it uses less digits than its factorization.

2112001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196815.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2112001021 is about 45956.5122806333. The cubic root of 2112001021 is about 1283.0139387466.

Adding to 2112001021 its reverse (1201002112), we get a palindrome (3313003133).

The spelling of 2112001021 in words is "two billion, one hundred twelve million, one thousand, twenty-one".