21350111303 has 4 divisors (see below), whose sum is σ = 21650817168. Its totient is φ = 21049405440.

The previous prime is 21350111269. The next prime is 21350111323. The reversal of 21350111303 is 30311105312.

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 21350111303 - 2¹⁰ = 21350110279 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 (21350111323) 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, 150352826 + ... + 150352967.

It is an arithmetic number, because the mean of its divisors is an integer number (5412704292).

Almost surely, 2^21350111303 is an apocalyptic number.

21350111303 is a deficient number, since it is larger than the sum of its proper divisors (300705865).

21350111303 is an equidigital number, since it uses as much as digits as its factorization.

21350111303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300705864.

The product of its (nonzero) digits is 270, while the sum is 20.

Adding to 21350111303 its reverse (30311105312), we get a palindrome (51661216615).

The spelling of 21350111303 in words is "twenty-one billion, three hundred fifty million, one hundred eleven thousand, three hundred three".