21013213103 has 8 divisors (see below), whose sum is σ = 23216645088. Its totient is φ = 18917265664.

The previous prime is 21013213099. The next prime is 21013213129. The reversal of 21013213103 is 30131231012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013213103 - 2² = 21013213099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013213183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26870726 + ... + 26871507.

It is an arithmetic number, because the mean of its divisors is an integer number (2902080636).

Almost surely, 2^21013213103 is an apocalyptic number.

21013213103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21013213103 is a deficient number, since it is larger than the sum of its proper divisors (2203431985).

21013213103 is a wasteful number, since it uses less digits than its factorization.

21013213103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53742273.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21013213103 its reverse (30131231012), we get a palindrome (51144444115).

The spelling of 21013213103 in words is "twenty-one billion, thirteen million, two hundred thirteen thousand, one hundred three".