21342231233 has 4 divisors (see below), whose sum is σ = 21346527828. Its totient is φ = 21337934640.

The previous prime is 21342231227. The next prime is 21342231259. The reversal of 21342231233 is 33213224312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12040014529 + 9302216704 = 109727^2 + 96448^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342231233 - 2⁴ = 21342231217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21342231433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2140838 + ... + 2150783.

It is an arithmetic number, because the mean of its divisors is an integer number (5336631957).

Almost surely, 2^21342231233 is an apocalyptic number.

It is an amenable number.

21342231233 is a deficient number, since it is larger than the sum of its proper divisors (4296595).

21342231233 is an equidigital number, since it uses as much as digits as its factorization.

21342231233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296594.

The product of its digits is 5184, while the sum is 26.

Adding to 21342231233 its reverse (33213224312), we get a palindrome (54555455545).

The spelling of 21342231233 in words is "twenty-one billion, three hundred forty-two million, two hundred thirty-one thousand, two hundred thirty-three".