21243103422245 has 16 divisors (see below), whose sum is σ = 26833519289280. Its totient is φ = 16099960982400.

The previous prime is 21243103422199. The next prime is 21243103422259. The reversal of 21243103422245 is 54222430134212.

It is not a de Polignac number, because 21243103422245 - 2¹⁸ = 21243103160101 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 28101425 + ... + 28847465.

It is an arithmetic number, because the mean of its divisors is an integer number (1677094955580).

Almost surely, 2^{21243103422245} is an apocalyptic number.

It is an amenable number.

21243103422245 is a deficient number, since it is larger than the sum of its proper divisors (5590415867035).

21243103422245 is a wasteful number, since it uses less digits than its factorization.

21243103422245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045796.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21243103422245 its reverse (54222430134212), we get a palindrome (75465533556457).

The spelling of 21243103422245 in words is "twenty-one trillion, two hundred forty-three billion, one hundred three million, four hundred twenty-two thousand, two hundred forty-five".