21201111203 has 4 divisors (see below), whose sum is σ = 21885018048. Its totient is φ = 20517204360.

The previous prime is 21201111199. The next prime is 21201111301. The reversal of 21201111203 is 30211110212.

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 21201111203 - 2² = 21201111199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201113203) 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, 341953376 + ... + 341953437.

It is an arithmetic number, because the mean of its divisors is an integer number (5471254512).

Almost surely, 2^21201111203 is an apocalyptic number.

21201111203 is a deficient number, since it is larger than the sum of its proper divisors (683906845).

21201111203 is an equidigital number, since it uses as much as digits as its factorization.

21201111203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683906844.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21201111203 its reverse (30211110212), we get a palindrome (51412221415).

Subtracting 21201111203 from its reverse (30211110212), we obtain a palindrome (9009999009).

The spelling of 21201111203 in words is "twenty-one billion, two hundred one million, one hundred eleven thousand, two hundred three".