21002102331103 has 4 divisors (see below), whose sum is σ = 21915237215088. Its totient is φ = 20088967447120.

The previous prime is 21002102331097. The next prime is 21002102331143. The reversal of 21002102331103 is 30113320120012.

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 21002102331103 - 2⁵ = 21002102331071 is a prime.

It is a super-2 number, since 2×21002102331103² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002102331143) 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, 456567441958 + ... + 456567442003.

It is an arithmetic number, because the mean of its divisors is an integer number (5478809303772).

Almost surely, 2^{21002102331103} is an apocalyptic number.

21002102331103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21002102331103 is a deficient number, since it is larger than the sum of its proper divisors (913134883985).

21002102331103 is an equidigital number, since it uses as much as digits as its factorization.

21002102331103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913134883984.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21002102331103 its reverse (30113320120012), we get a palindrome (51115422451115).

The spelling of 21002102331103 in words is "twenty-one trillion, two billion, one hundred two million, three hundred thirty-one thousand, one hundred three".