2012122120021 has 4 divisors (see below), whose sum is σ = 2166900744652. Its totient is φ = 1857343495392.

The previous prime is 2012122119937. The next prime is 2012122120031. The reversal of 2012122120021 is 1200212212102.

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 360162018225 + 1651960101796 = 600135^2 + 1285286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2012122120021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012122119977 and 2012122120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012122120031) 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, 77389312296 + ... + 77389312321.

It is an arithmetic number, because the mean of its divisors is an integer number (541725186163).

Almost surely, 2^{2012122120021} is an apocalyptic number.

It is an amenable number.

2012122120021 is a deficient number, since it is larger than the sum of its proper divisors (154778624631).

2012122120021 is a wasteful number, since it uses less digits than its factorization.

2012122120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154778624630.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2012122120021 its reverse (1200212212102), we get a palindrome (3212334332123).

The spelling of 2012122120021 in words is "two trillion, twelve billion, one hundred twenty-two million, one hundred twenty thousand, twenty-one".