21344131233 has 24 divisors (see below), whose sum is σ = 32062980768. Its totient is φ = 14189053824.

The previous prime is 21344131201. The next prime is 21344131273. The reversal of 21344131233 is 33213144312.

It is a happy number.

21344131233 is a `hidden beast` number, since 2 + 1 + 344 + 1 + 312 + 3 + 3 = 666.

It is not a de Polignac number, because 21344131233 - 2⁵ = 21344131201 is a prime.

It is a super-2 number, since 2×21344131233² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21344131197 and 21344131206.

It is not an unprimeable number, because it can be changed into a prime (21344131273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38635 + ... + 210192.

It is an arithmetic number, because the mean of its divisors is an integer number (1335957532).

Almost surely, 2^21344131233 is an apocalyptic number.

It is an amenable number.

21344131233 is a deficient number, since it is larger than the sum of its proper divisors (10718849535).

21344131233 is an equidigital number, since it uses as much as digits as its factorization.

21344131233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249195 (or 249183 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21344131233 its reverse (33213144312), we get a palindrome (54557275545).

The spelling of 21344131233 in words is "twenty-one billion, three hundred forty-four million, one hundred thirty-one thousand, two hundred thirty-three".