21311033233 has 32 divisors (see below), whose sum is σ = 25135165440. Its totient is φ = 17690849280.

The previous prime is 21311033209. The next prime is 21311033243. The reversal of 21311033233 is 33233011312.

It is a cyclic number.

It is not a de Polignac number, because 21311033233 - 2⁵ = 21311033201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21311033243) 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 31 ways as a sum of consecutive naturals, for example, 27712273 + ... + 27713041.

It is an arithmetic number, because the mean of its divisors is an integer number (785473920).

Almost surely, 2^21311033233 is an apocalyptic number.

It is an amenable number.

21311033233 is a deficient number, since it is larger than the sum of its proper divisors (3824132207).

21311033233 is a wasteful number, since it uses less digits than its factorization.

21311033233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597.

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

Adding to 21311033233 its reverse (33233011312), we get a palindrome (54544044545).

The spelling of 21311033233 in words is "twenty-one billion, three hundred eleven million, thirty-three thousand, two hundred thirty-three".