21102344553203 has 4 divisors (see below), whose sum is σ = 21102355845048. Its totient is φ = 21102333261360.

The previous prime is 21102344553197. The next prime is 21102344553239. The reversal of 21102344553203 is 30235544320112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21102344553203 - 2¹⁶ = 21102344487667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102344553503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100626 + ... + 6827687.

It is an arithmetic number, because the mean of its divisors is an integer number (5275588961262).

Almost surely, 2^{21102344553203} is an apocalyptic number.

21102344553203 is a deficient number, since it is larger than the sum of its proper divisors (11291845).

21102344553203 is an equidigital number, since it uses as much as digits as its factorization.

21102344553203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11291844.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21102344553203 its reverse (30235544320112), we get a palindrome (51337888873315).

The spelling of 21102344553203 in words is "twenty-one trillion, one hundred two billion, three hundred forty-four million, five hundred fifty-three thousand, two hundred three".