21023211203103 has 4 divisors (see below), whose sum is σ = 28030948270808. Its totient is φ = 14015474135400.

The previous prime is 21023211203089. The next prime is 21023211203143. The reversal of 21023211203103 is 30130211232012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21023211203103 - 2¹⁸ = 21023210940959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21023211203103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023211203143) 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, 3503868533848 + ... + 3503868533853.

It is an arithmetic number, because the mean of its divisors is an integer number (7007737067702).

Almost surely, 2^{21023211203103} is an apocalyptic number.

21023211203103 is a deficient number, since it is larger than the sum of its proper divisors (7007737067705).

21023211203103 is an equidigital number, since it uses as much as digits as its factorization.

21023211203103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007737067704.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21023211203103 its reverse (30130211232012), we get a palindrome (51153422435115).

The spelling of 21023211203103 in words is "twenty-one trillion, twenty-three billion, two hundred eleven million, two hundred three thousand, one hundred three".