2012012020021 has 4 divisors (see below), whose sum is σ = 2012073036012. Its totient is φ = 2011951004032.

The previous prime is 2012012019973. The next prime is 2012012020043. The reversal of 2012012020021 is 1200202102102.

It is a happy number.

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 1094295919396 + 917716100625 = 1046086^2 + 957975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012012020021 - 2³³ = 2003422085429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012012019983 and 2012012020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012012020061) 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, 30458506 + ... + 30524491.

It is an arithmetic number, because the mean of its divisors is an integer number (503018259003).

Almost surely, 2^{2012012020021} is an apocalyptic number.

It is an amenable number.

2012012020021 is a deficient number, since it is larger than the sum of its proper divisors (61015991).

2012012020021 is an equidigital number, since it uses as much as digits as its factorization.

2012012020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61015990.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2012012020021 its reverse (1200202102102), we get a palindrome (3212214122123).

It can be divided in two parts, 201201 and 2020021, that added together give a palindrome (2221222).

The spelling of 2012012020021 in words is "two trillion, twelve billion, twelve million, twenty thousand, twenty-one".