2121100033 has 4 divisors (see below), whose sum is σ = 2284261588. Its totient is φ = 1957938480.

The previous prime is 2121100021. The next prime is 2121100097. The reversal of 2121100033 is 3300011212.

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 1358069904 + 763030129 = 36852^2 + 27623^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121100033 - 2⁹ = 2121099521 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: 163161541 = 2121100033 / (2 + 1 + 2 + 1 + 1 + 0 + 0 + 0 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121099986 and 2121100022.

It is not an unprimeable number, because it can be changed into a prime (2121107033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81580758 + ... + 81580783.

It is an arithmetic number, because the mean of its divisors is an integer number (571065397).

Almost surely, 2^2121100033 is an apocalyptic number.

It is an amenable number.

2121100033 is a deficient number, since it is larger than the sum of its proper divisors (163161555).

2121100033 is a wasteful number, since it uses less digits than its factorization.

2121100033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163161554.

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

The square root of 2121100033 is about 46055.4017787273. The cubic root of 2121100033 is about 1284.8538106793.

Adding to 2121100033 its reverse (3300011212), we get a palindrome (5421111245).

The spelling of 2121100033 in words is "two billion, one hundred twenty-one million, one hundred thousand, thirty-three".