21124202223 has 16 divisors (see below), whose sum is σ = 29697382400. Its totient is φ = 13319380800.

The previous prime is 21124202221. The next prime is 21124202233. The reversal of 21124202223 is 32220242112.

It is not a de Polignac number, because 21124202223 - 2¹ = 21124202221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21124202223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124202221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274063 + ... + 342576.

It is an arithmetic number, because the mean of its divisors is an integer number (1856086400).

Almost surely, 2^21124202223 is an apocalyptic number.

21124202223 is a deficient number, since it is larger than the sum of its proper divisors (8573180177).

21124202223 is a wasteful number, since it uses less digits than its factorization.

21124202223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617262.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21124202223 its reverse (32220242112), we get a palindrome (53344444335).

The spelling of 21124202223 in words is "twenty-one billion, one hundred twenty-four million, two hundred two thousand, two hundred twenty-three".