20924199547217 has 2 divisors, whose sum is σ = 20924199547218. Its totient is φ = 20924199547216.

The previous prime is 20924199547159. The next prime is 20924199547219. The reversal of 20924199547217 is 71274599142902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10718787889936 + 10205411657281 = 3273956^2 + 3194591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20924199547217 is a prime.

It is a super-2 number, since 2×20924199547217² (a number of 27 digits) contains 22 as substring.

Together with 20924199547219, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20924199547217.

It is not a weakly prime, because it can be changed into another prime (20924199547219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10462099773608 + 10462099773609.

It is an arithmetic number, because the mean of its divisors is an integer number (10462099773609).

Almost surely, 2^{20924199547217} is an apocalyptic number.

It is an amenable number.

20924199547217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20924199547217 is an equidigital number, since it uses as much as digits as its factorization.

20924199547217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22861440, while the sum is 62.

The spelling of 20924199547217 in words is "twenty trillion, nine hundred twenty-four billion, one hundred ninety-nine million, five hundred forty-seven thousand, two hundred seventeen".