21253042604103 has 32 divisors (see below), whose sum is σ = 29582273129472. Its totient is φ = 13559543712000.

The previous prime is 21253042604069. The next prime is 21253042604119. The reversal of 21253042604103 is 30140624035212.

It is not a de Polignac number, because 21253042604103 - 2⁹ = 21253042603591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253042604173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31946326 + ... + 32604812.

It is an arithmetic number, because the mean of its divisors is an integer number (924446035296).

Almost surely, 2^{21253042604103} is an apocalyptic number.

21253042604103 is a deficient number, since it is larger than the sum of its proper divisors (8329230525369).

21253042604103 is a wasteful number, since it uses less digits than its factorization.

21253042604103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663535.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 21253042604103 its reverse (30140624035212), we get a palindrome (51393666639315).

The spelling of 21253042604103 in words is "twenty-one trillion, two hundred fifty-three billion, forty-two million, six hundred four thousand, one hundred three".