21124322245 has 32 divisors (see below), whose sum is σ = 28257556320. Its totient is φ = 15052477440.

The previous prime is 21124322243. The next prime is 21124322269. The reversal of 21124322245 is 54222342112.

It can be written as a sum of positive squares in 16 ways, for example, as 3998412289 + 17125909956 = 63233^2 + 130866^2 .

It is not a de Polignac number, because 21124322245 - 2¹ = 21124322243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124322243) 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 31 ways as a sum of consecutive naturals, for example, 5391027 + ... + 5394943.

It is an arithmetic number, because the mean of its divisors is an integer number (883048635).

Almost surely, 2^21124322245 is an apocalyptic number.

It is an amenable number.

21124322245 is a deficient number, since it is larger than the sum of its proper divisors (7133234075).

21124322245 is a wasteful number, since it uses less digits than its factorization.

21124322245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6825.

The product of its digits is 7680, while the sum is 28.

Adding to 21124322245 its reverse (54222342112), we get a palindrome (75346664357).

The spelling of 21124322245 in words is "twenty-one billion, one hundred twenty-four million, three hundred twenty-two thousand, two hundred forty-five".