21121313323 has 8 divisors (see below), whose sum is σ = 23042650176. Its totient is φ = 19200179400.

The previous prime is 21121313249. The next prime is 21121313357. The reversal of 21121313323 is 32331312112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121313323 is a prime.

It is a super-3 number, since 3×21121313323³ (a number of 32 digits) contains 333 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 = 21121313294 and 21121313303.

It is not an unprimeable number, because it can be changed into a prime (21121313923) 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, 238740 + ... + 315022.

It is an arithmetic number, because the mean of its divisors is an integer number (2880331272).

Almost surely, 2^21121313323 is an apocalyptic number.

21121313323 is a deficient number, since it is larger than the sum of its proper divisors (1921336853).

21121313323 is a wasteful number, since it uses less digits than its factorization.

21121313323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101465.

The product of its digits is 648, while the sum is 22.

Adding to 21121313323 its reverse (32331312112), we get a palindrome (53452625435).

The spelling of 21121313323 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirteen thousand, three hundred twenty-three".