2112101212021 has 4 divisors (see below), whose sum is σ = 2112124202892. Its totient is φ = 2112078221152.

The previous prime is 2112101212019. The next prime is 2112101212031. The reversal of 2112101212021 is 1202121012112.

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 270342803025 + 1841758408996 = 519945^2 + 1357114^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112101212021 - 2¹ = 2112101212019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112101211986 and 2112101212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112101212031) 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, 11357080 + ... + 11541553.

It is an arithmetic number, because the mean of its divisors is an integer number (528031050723).

Almost surely, 2^{2112101212021} is an apocalyptic number.

It is an amenable number.

2112101212021 is a deficient number, since it is larger than the sum of its proper divisors (22990871).

2112101212021 is an equidigital number, since it uses as much as digits as its factorization.

2112101212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22990870.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2112101212021 its reverse (1202121012112), we get a palindrome (3314222224133).

The spelling of 2112101212021 in words is "two trillion, one hundred twelve billion, one hundred one million, two hundred twelve thousand, twenty-one".