2121418633 has 4 divisors (see below), whose sum is σ = 2130523668. Its totient is φ = 2112313600.

The previous prime is 2121418603. The next prime is 2121418667. The reversal of 2121418633 is 3368141212.

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 1027330704 + 1094087929 = 32052^2 + 33077^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121418633 - 2⁵ = 2121418601 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121418595 and 2121418604.

It is not an unprimeable number, because it can be changed into a prime (2121418603) 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, 4552168 + ... + 4552633.

It is an arithmetic number, because the mean of its divisors is an integer number (532630917).

Almost surely, 2^2121418633 is an apocalyptic number.

It is an amenable number.

2121418633 is a deficient number, since it is larger than the sum of its proper divisors (9105035).

2121418633 is an equidigital number, since it uses as much as digits as its factorization.

2121418633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9105034.

The product of its digits is 6912, while the sum is 31.

The square root of 2121418633 is about 46058.8605265046. The cubic root of 2121418633 is about 1284.9181379817.

Adding to 2121418633 its reverse (3368141212), we get a palindrome (5489559845).

The spelling of 2121418633 in words is "two billion, one hundred twenty-one million, four hundred eighteen thousand, six hundred thirty-three".