21322123 has 8 divisors (see below), whose sum is σ = 22813520. Its totient is φ = 19867680.

The previous prime is 21322117. The next prime is 21322129. The reversal of 21322123 is 32122312.

It is an interprime number because it is at equal distance from previous prime (21322117) and next prime (21322129).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21322123 - 2¹³ = 21313931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21322097 and 21322106.

It is not an unprimeable number, because it can be changed into a prime (21322129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8040 + ... + 10357.

It is an arithmetic number, because the mean of its divisors is an integer number (2851690).

Almost surely, 2^21322123 is an apocalyptic number.

21322123 is a deficient number, since it is larger than the sum of its proper divisors (1491397).

21322123 is a wasteful number, since it uses less digits than its factorization.

21322123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18477.

The product of its digits is 144, while the sum is 16.

The square root of 21322123 is about 4617.5884398677. The cubic root of 21322123 is about 277.2959211596.

Adding to 21322123 its reverse (32122312), we get a palindrome (53444435).

The spelling of 21322123 in words is "twenty-one million, three hundred twenty-two thousand, one hundred twenty-three".