21013334033 has 4 divisors (see below), whose sum is σ = 21020256180. Its totient is φ = 21006411888.

The previous prime is 21013334009. The next prime is 21013334081. The reversal of 21013334033 is 33043331012.

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 20023099009 + 990235024 = 141503^2 + 31468^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013334033 - 2¹² = 21013329937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013334233) 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, 3456518 + ... + 3462591.

It is an arithmetic number, because the mean of its divisors is an integer number (5255064045).

Almost surely, 2^21013334033 is an apocalyptic number.

It is an amenable number.

21013334033 is a deficient number, since it is larger than the sum of its proper divisors (6922147).

21013334033 is an equidigital number, since it uses as much as digits as its factorization.

21013334033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6922146.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21013334033 its reverse (33043331012), we get a palindrome (54056665045).

The spelling of 21013334033 in words is "twenty-one billion, thirteen million, three hundred thirty-four thousand, thirty-three".