21019170401617 has 2 divisors, whose sum is σ = 21019170401618. Its totient is φ = 21019170401616.

The previous prime is 21019170401569. The next prime is 21019170401641. The reversal of 21019170401617 is 71610407191012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16097676620481 + 4921493781136 = 4012191^2 + 2218444^2 .

It is a cyclic number.

It is not a de Polignac number, because 21019170401617 - 2¹⁵ = 21019170368849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21019170401617.

It is not a weakly prime, because it can be changed into another prime (21019170408617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10509585200808 + 10509585200809.

It is an arithmetic number, because the mean of its divisors is an integer number (10509585200809).

Almost surely, 2^{21019170401617} is an apocalyptic number.

It is an amenable number.

21019170401617 is a deficient number, since it is larger than the sum of its proper divisors (1).

21019170401617 is an equidigital number, since it uses as much as digits as its factorization.

21019170401617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 40.

Adding to 21019170401617 its reverse (71610407191012), we get a palindrome (92629577592629).

The spelling of 21019170401617 in words is "twenty-one trillion, nineteen billion, one hundred seventy million, four hundred one thousand, six hundred seventeen".