21131342233 has 8 divisors (see below), whose sum is σ = 22472834720. Its totient is φ = 19812781440.

The previous prime is 21131342213. The next prime is 21131342249. The reversal of 21131342233 is 33224313112.

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 21131342233 - 2⁵ = 21131342201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21131342198 and 21131342207.

It is not an unprimeable number, because it can be changed into a prime (21131342213) 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, 5731023 + ... + 5734708.

It is an arithmetic number, because the mean of its divisors is an integer number (2809104340).

Almost surely, 2^21131342233 is an apocalyptic number.

It is an amenable number.

21131342233 is a deficient number, since it is larger than the sum of its proper divisors (1341492487).

21131342233 is a wasteful number, since it uses less digits than its factorization.

21131342233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11465847.

The product of its digits is 2592, while the sum is 25.

Adding to 21131342233 its reverse (33224313112), we get a palindrome (54355655345).

The spelling of 21131342233 in words is "twenty-one billion, one hundred thirty-one million, three hundred forty-two thousand, two hundred thirty-three".