21033033311033 has 4 divisors (see below), whose sum is σ = 21074355577380. Its totient is φ = 20991711044688.

The previous prime is 21033033310999. The next prime is 21033033311077. The reversal of 21033033311033 is 33011333033012.

It is a happy number.

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 10164855168169 + 10868178142864 = 3188237^2 + 3296692^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033033311033 - 2²⁴ = 21033016533817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033033310993 and 21033033311011.

It is not an unprimeable number, because it can be changed into a prime (21033033331033) 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, 20661132410 + ... + 20661133427.

It is an arithmetic number, because the mean of its divisors is an integer number (5268588894345).

Almost surely, 2^{21033033311033} is an apocalyptic number.

It is an amenable number.

21033033311033 is a deficient number, since it is larger than the sum of its proper divisors (41322266347).

21033033311033 is an equidigital number, since it uses as much as digits as its factorization.

21033033311033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41322266346.

The product of its (nonzero) digits is 4374, while the sum is 26.

Adding to 21033033311033 its reverse (33011333033012), we get a palindrome (54044366344045).

The spelling of 21033033311033 in words is "twenty-one trillion, thirty-three billion, thirty-three million, three hundred eleven thousand, thirty-three".