2133331021 has 4 divisors (see below), whose sum is σ = 2133658332. Its totient is φ = 2133003712.

The previous prime is 2133331019. The next prime is 2133331033. The reversal of 2133331021 is 1201333312.

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 351562500 + 1781768521 = 18750^2 + 42211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2133331021 - 2¹ = 2133331019 is a prime.

It is a super-2 number, since 2×2133331021² = 9102202490321804882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2133331021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133331091) 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, 153676 + ... + 166981.

It is an arithmetic number, because the mean of its divisors is an integer number (533414583).

Almost surely, 2^2133331021 is an apocalyptic number.

It is an amenable number.

2133331021 is a deficient number, since it is larger than the sum of its proper divisors (327311).

2133331021 is an equidigital number, since it uses as much as digits as its factorization.

2133331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327310.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 2133331021 is about 46187.9965034207. The cubic root of 2133331021 is about 1287.3187143629.

Adding to 2133331021 its reverse (1201333312), we get a palindrome (3334664333).

The spelling of 2133331021 in words is "two billion, one hundred thirty-three million, three hundred thirty-one thousand, twenty-one".