2121213331 has 4 divisors (see below), whose sum is σ = 2123232664. Its totient is φ = 2119194000.

The previous prime is 2121213317. The next prime is 2121213337. The reversal of 2121213331 is 1333121212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121213331 - 2¹¹ = 2121211283 is a prime.

It is a super-2 number, since 2×2121213331² = 8999091991224231122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121213299 and 2121213308.

It is not an unprimeable number, because it can be changed into a prime (2121213337) 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, 1008090 + ... + 1010191.

It is an arithmetic number, because the mean of its divisors is an integer number (530808166).

Almost surely, 2^2121213331 is an apocalyptic number.

2121213331 is a deficient number, since it is larger than the sum of its proper divisors (2019333).

2121213331 is a wasteful number, since it uses less digits than its factorization.

2121213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019332.

The product of its digits is 216, while the sum is 19.

The square root of 2121213331 is about 46056.6317808847. The cubic root of 2121213331 is about 1284.8766869814.

Adding to 2121213331 its reverse (1333121212), we get a palindrome (3454334543).

It can be divided in two parts, 21212 and 13331, that added together give a palindrome (34543).

The spelling of 2121213331 in words is "two billion, one hundred twenty-one million, two hundred thirteen thousand, three hundred thirty-one".