21001232321103 has 4 divisors (see below), whose sum is σ = 28001643094808. Its totient is φ = 14000821547400.

The previous prime is 21001232321089. The next prime is 21001232321107. The reversal of 21001232321103 is 30112323210012.

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

It is not a de Polignac number, because 21001232321103 - 2⁶ = 21001232321039 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 21001232321103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001232321107) 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, 3500205386848 + ... + 3500205386853.

It is an arithmetic number, because the mean of its divisors is an integer number (7000410773702).

Almost surely, 2^{21001232321103} is an apocalyptic number.

21001232321103 is a deficient number, since it is larger than the sum of its proper divisors (7000410773705).

21001232321103 is an equidigital number, since it uses as much as digits as its factorization.

21001232321103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000410773704.

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

Adding to 21001232321103 its reverse (30112323210012), we get a palindrome (51113555531115).

The spelling of 21001232321103 in words is "twenty-one trillion, one billion, two hundred thirty-two million, three hundred twenty-one thousand, one hundred three".