20203214919917 has 2 divisors, whose sum is σ = 20203214919918. Its totient is φ = 20203214919916.

The previous prime is 20203214919883. The next prime is 20203214919971. The reversal of 20203214919917 is 71991941230202.

Together with next prime (20203214919971) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15658213046116 + 4545001873801 = 3957046^2 + 2131901^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203214919917 - 2¹⁰ = 20203214918893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20203214918917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101607459958 + 10101607459959.

It is an arithmetic number, because the mean of its divisors is an integer number (10101607459959).

Almost surely, 2^{20203214919917} is an apocalyptic number.

It is an amenable number.

20203214919917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203214919917 is an equidigital number, since it uses as much as digits as its factorization.

20203214919917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 20203214919917 in words is "twenty trillion, two hundred three billion, two hundred fourteen million, nine hundred nineteen thousand, nine hundred seventeen".