2012020172021 has 2 divisors, whose sum is σ = 2012020172022. Its totient is φ = 2012020172020.

The previous prime is 2012020172011. The next prime is 2012020172033. The reversal of 2012020172021 is 1202710202102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1343246230225 + 668773941796 = 1158985^2 + 817786^2 .

It is a cyclic number.

It is not a de Polignac number, because 2012020172021 - 2⁶ = 2012020171957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2012020171984 and 2012020172002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2012020172011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006010086010 + 1006010086011.

It is an arithmetic number, because the mean of its divisors is an integer number (1006010086011).

Almost surely, 2^{2012020172021} is an apocalyptic number.

It is an amenable number.

2012020172021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2012020172021 is an equidigital number, since it uses as much as digits as its factorization.

2012020172021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 2012020172021 its reverse (1202710202102), we get a palindrome (3214730374123).

The spelling of 2012020172021 in words is "two trillion, twelve billion, twenty million, one hundred seventy-two thousand, twenty-one".