21333112033 has 4 divisors (see below), whose sum is σ = 21333511828. Its totient is φ = 21332712240.

The previous prime is 21333111983. The next prime is 21333112039. The reversal of 21333112033 is 33021133312.

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 10426860544 + 10906251489 = 102112^2 + 104433^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333112033 - 2²⁹ = 20796241121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21333111995 and 21333112013.

It is not an unprimeable number, because it can be changed into a prime (21333112039) 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, 104766 + ... + 231607.

It is an arithmetic number, because the mean of its divisors is an integer number (5333377957).

Almost surely, 2^21333112033 is an apocalyptic number.

It is an amenable number.

21333112033 is a deficient number, since it is larger than the sum of its proper divisors (399795).

21333112033 is an equidigital number, since it uses as much as digits as its factorization.

21333112033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399794.

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

Adding to 21333112033 its reverse (33021133312), we get a palindrome (54354245345).

The spelling of 21333112033 in words is "twenty-one billion, three hundred thirty-three million, one hundred twelve thousand, thirty-three".