21201311103 has 8 divisors (see below), whose sum is σ = 32306759808. Its totient is φ = 12115034904.

The previous prime is 21201311057. The next prime is 21201311107. The reversal of 21201311103 is 30111310212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21201311103 - 2⁸ = 21201310847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201311107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504793101 + ... + 504793142.

It is an arithmetic number, because the mean of its divisors is an integer number (4038344976).

Almost surely, 2^21201311103 is an apocalyptic number.

21201311103 is a deficient number, since it is larger than the sum of its proper divisors (11105448705).

21201311103 is a wasteful number, since it uses less digits than its factorization.

21201311103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009586253.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21201311103 its reverse (30111310212), we get a palindrome (51312621315).

The spelling of 21201311103 in words is "twenty-one billion, two hundred one million, three hundred eleven thousand, one hundred three".