21243332333 has 4 divisors (see below), whose sum is σ = 21243691548. Its totient is φ = 21242973120.

The previous prime is 21243332317. The next prime is 21243332347. The reversal of 21243332333 is 33323334212.

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 17407635844 + 3835696489 = 131938^2 + 61933^2 .

It is a cyclic number.

It is not a de Polignac number, because 21243332333 - 2⁴ = 21243332317 is a prime.

It is a super-2 number, since 2×21243332333² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21243332296 and 21243332305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243332393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67628 + ... + 216933.

It is an arithmetic number, because the mean of its divisors is an integer number (5310922887).

Almost surely, 2^21243332333 is an apocalyptic number.

It is an amenable number.

21243332333 is a deficient number, since it is larger than the sum of its proper divisors (359215).

21243332333 is an equidigital number, since it uses as much as digits as its factorization.

21243332333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359214.

The product of its digits is 23328, while the sum is 29.

Adding to 21243332333 its reverse (33323334212), we get a palindrome (54566666545).

The spelling of 21243332333 in words is "twenty-one billion, two hundred forty-three million, three hundred thirty-two thousand, three hundred thirty-three".