21023121233333 has 4 divisors (see below), whose sum is σ = 21023555311980. Its totient is φ = 21022687154688.

The previous prime is 21023121233329. The next prime is 21023121233353. The reversal of 21023121233333 is 33333212132012.

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 15170892570289 + 5852228663044 = 3894983^2 + 2419138^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023121233333 - 2² = 21023121233329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21023121233296 and 21023121233305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023121233353) 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, 216966668 + ... + 217063541.

It is an arithmetic number, because the mean of its divisors is an integer number (5255888827995).

Almost surely, 2^{21023121233333} is an apocalyptic number.

It is an amenable number.

21023121233333 is a deficient number, since it is larger than the sum of its proper divisors (434078647).

21023121233333 is an equidigital number, since it uses as much as digits as its factorization.

21023121233333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434078646.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 21023121233333 its reverse (33333212132012), we get a palindrome (54356333365345).

The spelling of 21023121233333 in words is "twenty-one trillion, twenty-three billion, one hundred twenty-one million, two hundred thirty-three thousand, three hundred thirty-three".