2133220021 has 4 divisors (see below), whose sum is σ = 2133329632. Its totient is φ = 2133110412.

The previous prime is 2133220009. The next prime is 2133220087. The reversal of 2133220021 is 1200223312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2133220021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2133219977 and 2133220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133220321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16851 + ... + 67456.

It is an arithmetic number, because the mean of its divisors is an integer number (533332408).

Almost surely, 2^2133220021 is an apocalyptic number.

It is an amenable number.

2133220021 is a deficient number, since it is larger than the sum of its proper divisors (109611).

2133220021 is an equidigital number, since it uses as much as digits as its factorization.

2133220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109610.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2133220021 is about 46186.7948768909. The cubic root of 2133220021 is about 1287.2963870175.

Adding to 2133220021 its reverse (1200223312), we get a palindrome (3333443333).

The spelling of 2133220021 in words is "two billion, one hundred thirty-three million, two hundred twenty thousand, twenty-one".