21002121002333 has 4 divisors (see below), whose sum is σ = 21039826785660. Its totient is φ = 20964415219008.

The previous prime is 21002121002311. The next prime is 21002121002351. The reversal of 21002121002333 is 33320012120012.

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 5036806184089 + 15965314818244 = 2244283^2 + 3995662^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002121002333 - 2²⁴ = 21002104225117 is a prime.

It is a super-3 number, since 3×21002121002333³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002121002353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18852890828 + ... + 18852891941.

It is an arithmetic number, because the mean of its divisors is an integer number (5259956696415).

Almost surely, 2^{21002121002333} is an apocalyptic number.

It is an amenable number.

21002121002333 is a deficient number, since it is larger than the sum of its proper divisors (37705783327).

21002121002333 is an equidigital number, since it uses as much as digits as its factorization.

21002121002333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37705783326.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21002121002333 its reverse (33320012120012), we get a palindrome (54322133122345).

The spelling of 21002121002333 in words is "twenty-one trillion, two billion, one hundred twenty-one million, two thousand, three hundred thirty-three".