21033131233 has 8 divisors (see below), whose sum is σ = 22141900800. Its totient is φ = 19924537968.

The previous prime is 21033131209. The next prime is 21033131239. The reversal of 21033131233 is 33213133012.

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 21033131233 - 2⁹ = 21033130721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033131239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251808 + ... + 324766.

It is an arithmetic number, because the mean of its divisors is an integer number (2767737600).

Almost surely, 2^21033131233 is an apocalyptic number.

It is an amenable number.

21033131233 is a deficient number, since it is larger than the sum of its proper divisors (1108769567).

21033131233 is a wasteful number, since it uses less digits than its factorization.

21033131233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88151.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21033131233 its reverse (33213133012), we get a palindrome (54246264245).

The spelling of 21033131233 in words is "twenty-one billion, thirty-three million, one hundred thirty-one thousand, two hundred thirty-three".