21121322323 has 8 divisors (see below), whose sum is σ = 21941218656. Its totient is φ = 20315937600.

The previous prime is 21121322293. The next prime is 21121322347. The reversal of 21121322323 is 32322312112.

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 21121322323 - 2⁹ = 21121321811 is a prime.

It is a super-4 number, since 4×21121322323⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121322294 and 21121322303.

It is not an unprimeable number, because it can be changed into a prime (21121322423) 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, 3624936 + ... + 3630757.

It is an arithmetic number, because the mean of its divisors is an integer number (2742652332).

Almost surely, 2^21121322323 is an apocalyptic number.

21121322323 is a deficient number, since it is larger than the sum of its proper divisors (819896333).

21121322323 is an equidigital number, since it uses as much as digits as its factorization.

21121322323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7255805.

The product of its digits is 864, while the sum is 22.

Adding to 21121322323 its reverse (32322312112), we get a palindrome (53443634435).

The spelling of 21121322323 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-two thousand, three hundred twenty-three".