20103100321 has 4 divisors (see below), whose sum is σ = 21285635652. Its totient is φ = 18920564992.

The previous prime is 20103100313. The next prime is 20103100349. The reversal of 20103100321 is 12300130102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12050550625 + 8052549696 = 109775^2 + 89736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20103100321 - 2³ = 20103100313 is a prime.

It is a super-3 number, since 3×20103100321³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20103100351) 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, 591267640 + ... + 591267673.

It is an arithmetic number, because the mean of its divisors is an integer number (5321408913).

Almost surely, 2^20103100321 is an apocalyptic number.

It is an amenable number.

20103100321 is a deficient number, since it is larger than the sum of its proper divisors (1182535331).

20103100321 is a wasteful number, since it uses less digits than its factorization.

20103100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182535330.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 20103100321 its reverse (12300130102), we get a palindrome (32403230423).

The spelling of 20103100321 in words is "twenty billion, one hundred three million, one hundred thousand, three hundred twenty-one".