21122442323 has 4 divisors (see below), whose sum is σ = 21480449880. Its totient is φ = 20764434768.

The previous prime is 21122442301. The next prime is 21122442343. The reversal of 21122442323 is 32324422112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21122442323 - 2¹⁴ = 21122425939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122442292 and 21122442301.

It is not an unprimeable number, because it can be changed into a prime (21122442343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179003690 + ... + 179003807.

It is an arithmetic number, because the mean of its divisors is an integer number (5370112470).

Almost surely, 2^21122442323 is an apocalyptic number.

21122442323 is a deficient number, since it is larger than the sum of its proper divisors (358007557).

21122442323 is an equidigital number, since it uses as much as digits as its factorization.

21122442323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358007556.

The product of its digits is 4608, while the sum is 26.

Adding to 21122442323 its reverse (32324422112), we get a palindrome (53446864435).

The spelling of 21122442323 in words is "twenty-one billion, one hundred twenty-two million, four hundred forty-two thousand, three hundred twenty-three".