21112300203 has 4 divisors (see below), whose sum is σ = 28149733608. Its totient is φ = 14074866800.

The previous prime is 21112300199. The next prime is 21112300241. The reversal of 21112300203 is 30200321112.

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 21112300203 - 2² = 21112300199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112300403) 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, 3518716698 + ... + 3518716703.

It is an arithmetic number, because the mean of its divisors is an integer number (7037433402).

Almost surely, 2^21112300203 is an apocalyptic number.

21112300203 is a deficient number, since it is larger than the sum of its proper divisors (7037433405).

21112300203 is an equidigital number, since it uses as much as digits as its factorization.

21112300203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037433404.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21112300203 its reverse (30200321112), we get a palindrome (51312621315).

The spelling of 21112300203 in words is "twenty-one billion, one hundred twelve million, three hundred thousand, two hundred three".