21313121111231 has 8 divisors (see below), whose sum is σ = 22650725699280. Its totient is φ = 19984837810048.

The previous prime is 21313121111077. The next prime is 21313121111287. The reversal of 21313121111231 is 13211112131312.

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 21313121111231 - 2²⁶ = 21313054002367 is a prime.

It is a super-3 number, since 3×21313121111231³ (a number of 41 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 = 21313121111197 and 21313121111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313121111291) 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, 2330317001 + ... + 2330326146.

It is an arithmetic number, because the mean of its divisors is an integer number (2831340712410).

Almost surely, 2^{21313121111231} is an apocalyptic number.

21313121111231 is a deficient number, since it is larger than the sum of its proper divisors (1337604588049).

21313121111231 is a wasteful number, since it uses less digits than its factorization.

21313121111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660643433.

The product of its digits is 216, while the sum is 23.

Adding to 21313121111231 its reverse (13211112131312), we get a palindrome (34524233242543).

The spelling of 21313121111231 in words is "twenty-one trillion, three hundred thirteen billion, one hundred twenty-one million, one hundred eleven thousand, two hundred thirty-one".