20021320103 has 4 divisors (see below), whose sum is σ = 20116208088. Its totient is φ = 19926432120.

The previous prime is 20021320093. The next prime is 20021320133. The reversal of 20021320103 is 30102312002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20021320103 - 2⁸ = 20021319847 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 (20021320133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47443676 + ... + 47444097.

It is an arithmetic number, because the mean of its divisors is an integer number (5029052022).

Almost surely, 2^20021320103 is an apocalyptic number.

20021320103 is a deficient number, since it is larger than the sum of its proper divisors (94887985).

20021320103 is an equidigital number, since it uses as much as digits as its factorization.

20021320103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94887984.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20021320103 its reverse (30102312002), we get a palindrome (50123632105).

The spelling of 20021320103 in words is "twenty billion, twenty-one million, three hundred twenty thousand, one hundred three".