20321013103 has 4 divisors (see below), whose sum is σ = 20321921088. Its totient is φ = 20320105120.

The previous prime is 20321013077. The next prime is 20321013137. The reversal of 20321013103 is 30131012302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30131012302 = 2 ⋅15065506151.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321013103 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 (20321013403) 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, 419551 + ... + 465472.

It is an arithmetic number, because the mean of its divisors is an integer number (5080480272).

Almost surely, 2^20321013103 is an apocalyptic number.

20321013103 is a deficient number, since it is larger than the sum of its proper divisors (907985).

20321013103 is an equidigital number, since it uses as much as digits as its factorization.

20321013103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907984.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20321013103 its reverse (30131012302), we get a palindrome (50452025405).

The spelling of 20321013103 in words is "twenty billion, three hundred twenty-one million, thirteen thousand, one hundred three".