21201123011303 has 4 divisors (see below), whose sum is σ = 21885030205248. Its totient is φ = 20517215817360.

The previous prime is 21201123011297. The next prime is 21201123011353. The reversal of 21201123011303 is 30311032110212.

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 21201123011303 - 2⁴ = 21201123011287 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 (21201123011353) 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, 341953596926 + ... + 341953596987.

It is an arithmetic number, because the mean of its divisors is an integer number (5471257551312).

Almost surely, 2^{21201123011303} is an apocalyptic number.

21201123011303 is a deficient number, since it is larger than the sum of its proper divisors (683907193945).

21201123011303 is an equidigital number, since it uses as much as digits as its factorization.

21201123011303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683907193944.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21201123011303 its reverse (30311032110212), we get a palindrome (51512155121515).

The spelling of 21201123011303 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-three million, eleven thousand, three hundred three".