21211113103 has 4 divisors (see below), whose sum is σ = 21211557408. Its totient is φ = 21210668800.

The previous prime is 21211113047. The next prime is 21211113109. The reversal of 21211113103 is 30131111212.

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 21211113103 - 2⁹ = 21211112591 is a prime.

It is a super-2 number, since 2×21211113103² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211113109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140551 + ... + 249352.

It is an arithmetic number, because the mean of its divisors is an integer number (5302889352).

Almost surely, 2^21211113103 is an apocalyptic number.

21211113103 is a deficient number, since it is larger than the sum of its proper divisors (444305).

21211113103 is an equidigital number, since it uses as much as digits as its factorization.

21211113103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444304.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21211113103 its reverse (30131111212), we get a palindrome (51342224315).

The spelling of 21211113103 in words is "twenty-one billion, two hundred eleven million, one hundred thirteen thousand, one hundred three".