21013230103 has 4 divisors (see below), whose sum is σ = 22249302480. Its totient is φ = 19777157728.

The previous prime is 21013230071. The next prime is 21013230131. The reversal of 21013230103 is 30103231012.

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 21013230103 - 2⁵ = 21013230071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013330103) 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, 618036163 + ... + 618036196.

It is an arithmetic number, because the mean of its divisors is an integer number (5562325620).

Almost surely, 2^21013230103 is an apocalyptic number.

21013230103 is a deficient number, since it is larger than the sum of its proper divisors (1236072377).

21013230103 is a wasteful number, since it uses less digits than its factorization.

21013230103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236072376.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21013230103 its reverse (30103231012), we get a palindrome (51116461115).

Subtracting 21013230103 from its reverse (30103231012), we obtain a palindrome (9090000909).

The spelling of 21013230103 in words is "twenty-one billion, thirteen million, two hundred thirty thousand, one hundred three".