20103021758857 has 2 divisors, whose sum is σ = 20103021758858. Its totient is φ = 20103021758856.

The previous prime is 20103021758777. The next prime is 20103021758863. The reversal of 20103021758857 is 75885712030102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13426684091536 + 6676337667321 = 3664244^2 + 2583861^2 .

It is a cyclic number.

It is not a de Polignac number, because 20103021758857 - 2¹⁵ = 20103021726089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20103021758857.

It is not a weakly prime, because it can be changed into another prime (20103021758867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051510879428 + 10051510879429.

It is an arithmetic number, because the mean of its divisors is an integer number (10051510879429).

Almost surely, 2^{20103021758857} is an apocalyptic number.

It is an amenable number.

20103021758857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20103021758857 is an equidigital number, since it uses as much as digits as its factorization.

20103021758857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 940800, while the sum is 49.

Adding to 20103021758857 its reverse (75885712030102), we get a palindrome (95988733788959).

The spelling of 20103021758857 in words is "twenty trillion, one hundred three billion, twenty-one million, seven hundred fifty-eight thousand, eight hundred fifty-seven".