20021103175 has 6 divisors (see below), whose sum is σ = 24826167968. Its totient is φ = 16016882520.

The previous prime is 20021103173. The next prime is 20021103239. The reversal of 20021103175 is 57130112002.

It is a happy number.

It is not a de Polignac number, because 20021103175 - 2¹ = 20021103173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021103173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400422039 + ... + 400422088.

Almost surely, 2^20021103175 is an apocalyptic number.

20021103175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20021103175 is a deficient number, since it is larger than the sum of its proper divisors (4805064793).

20021103175 is an equidigital number, since it uses as much as digits as its factorization.

20021103175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800844137 (or 800844132 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 22.

Adding to 20021103175 its reverse (57130112002), we get a palindrome (77151215177).

The spelling of 20021103175 in words is "twenty billion, twenty-one million, one hundred three thousand, one hundred seventy-five".