2133100021 has 4 divisors (see below), whose sum is σ = 2297184652. Its totient is φ = 1969015392.

The previous prime is 2133100019. The next prime is 2133100051. The reversal of 2133100021 is 1200013312.

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 322597521 + 1810502500 = 17961^2 + 42550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2133100021 - 2¹ = 2133100019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 164084617 = 2133100021 / (2 + 1 + 3 + 3 + 1 + 0 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2133099974 and 2133100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133100051) 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, 82042296 + ... + 82042321.

It is an arithmetic number, because the mean of its divisors is an integer number (574296163).

Almost surely, 2^2133100021 is an apocalyptic number.

It is an amenable number.

2133100021 is a deficient number, since it is larger than the sum of its proper divisors (164084631).

2133100021 is a wasteful number, since it uses less digits than its factorization.

2133100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164084630.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 2133100021 is about 46185.4957860149. The cubic root of 2133100021 is about 1287.2722484755.

Adding to 2133100021 its reverse (1200013312), we get a palindrome (3333113333).

The spelling of 2133100021 in words is "two billion, one hundred thirty-three million, one hundred thousand, twenty-one".