2012112122021 has 4 divisors (see below), whose sum is σ = 2012115972492. Its totient is φ = 2012108271552.

The previous prime is 2012112122017. The next prime is 2012112122023. The reversal of 2012112122021 is 1202212112102.

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 1422616780225 + 589495341796 = 1192735^2 + 767786^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012112122021 - 2² = 2012112122017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012112122023) 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, 989930 + ... + 2237003.

It is an arithmetic number, because the mean of its divisors is an integer number (503028993123).

Almost surely, 2^{2012112122021} is an apocalyptic number.

It is an amenable number.

2012112122021 is a deficient number, since it is larger than the sum of its proper divisors (3850471).

2012112122021 is an equidigital number, since it uses as much as digits as its factorization.

2012112122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3850470.

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

Adding to 2012112122021 its reverse (1202212112102), we get a palindrome (3214324234123).

It can be divided in two parts, 201211 and 2122021, that added together give a palindrome (2323232).

The spelling of 2012112122021 in words is "two trillion, twelve billion, one hundred twelve million, one hundred twenty-two thousand, twenty-one".