20012121002917 has 2 divisors, whose sum is σ = 20012121002918. Its totient is φ = 20012121002916.

The previous prime is 20012121002833. The next prime is 20012121003031. The reversal of 20012121002917 is 71920012121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19660630908961 + 351490093956 = 4434031^2 + 592866^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012121002917 - 2⁷ = 20012121002789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012121002117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006060501458 + 10006060501459.

It is an arithmetic number, because the mean of its divisors is an integer number (10006060501459).

Almost surely, 2^{20012121002917} is an apocalyptic number.

It is an amenable number.

20012121002917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012121002917 is an equidigital number, since it uses as much as digits as its factorization.

20012121002917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

Adding to 20012121002917 its reverse (71920012121002), we get a palindrome (91932133123919).

The spelling of 20012121002917 in words is "twenty trillion, twelve billion, one hundred twenty-one million, two thousand, nine hundred seventeen".