21033330123433 has 4 divisors (see below), whose sum is σ = 21033473727700. Its totient is φ = 21033186519168.

The previous prime is 21033330123301. The next prime is 21033330123437. The reversal of 21033330123433 is 33432103333012.

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 15978351327849 + 5054978795584 = 3997293^2 + 2248328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21033330123433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033330123395 and 21033330123404.

It is not an unprimeable number, because it can be changed into a prime (21033330123437) 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, 71582208 + ... + 71875441.

It is an arithmetic number, because the mean of its divisors is an integer number (5258368431925).

Almost surely, 2^{21033330123433} is an apocalyptic number.

It is an amenable number.

21033330123433 is a deficient number, since it is larger than the sum of its proper divisors (143604267).

21033330123433 is a wasteful number, since it uses less digits than its factorization.

21033330123433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143604266.

The product of its (nonzero) digits is 34992, while the sum is 31.

Adding to 21033330123433 its reverse (33432103333012), we get a palindrome (54465433456445).

The spelling of 21033330123433 in words is "twenty-one trillion, thirty-three billion, three hundred thirty million, one hundred twenty-three thousand, four hundred thirty-three".