20958142960217 has 2 divisors, whose sum is σ = 20958142960218. Its totient is φ = 20958142960216.

The previous prime is 20958142960211. The next prime is 20958142960291. The reversal of 20958142960217 is 71206924185902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12523643343376 + 8434499616841 = 3538876^2 + 2904221^2 .

It is a cyclic number.

It is not a de Polignac number, because 20958142960217 - 2²² = 20958138765913 is a prime.

It is not a weakly prime, because it can be changed into another prime (20958142960211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10479071480108 + 10479071480109.

It is an arithmetic number, because the mean of its divisors is an integer number (10479071480109).

Almost surely, 2^{20958142960217} is an apocalyptic number.

It is an amenable number.

20958142960217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20958142960217 is an equidigital number, since it uses as much as digits as its factorization.

20958142960217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The spelling of 20958142960217 in words is "twenty trillion, nine hundred fifty-eight billion, one hundred forty-two million, nine hundred sixty thousand, two hundred seventeen".