20021103173 has 2 divisors, whose sum is σ = 20021103174. Its totient is φ = 20021103172.

The previous prime is 20021103169. The next prime is 20021103239. The reversal of 20021103173 is 37130112002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12156606049 + 7864497124 = 110257^2 + 88682^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021103173 - 2² = 20021103169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021103103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010551586 + 10010551587.

It is an arithmetic number, because the mean of its divisors is an integer number (10010551587).

Almost surely, 2^20021103173 is an apocalyptic number.

It is an amenable number.

20021103173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021103173 is an equidigital number, since it uses as much as digits as its factorization.

20021103173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

Adding to 20021103173 its reverse (37130112002), we get a palindrome (57151215175).

The spelling of 20021103173 in words is "twenty billion, twenty-one million, one hundred three thousand, one hundred seventy-three".