2121213009 has 8 divisors (see below), whose sum is σ = 2856287232. Its totient is φ = 1400140400.

The previous prime is 2121213007. The next prime is 2121213041. The reversal of 2121213009 is 9003121212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121213009 - 2¹ = 2121213007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121213007) 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 7 ways as a sum of consecutive naturals, for example, 3500049 + ... + 3500654.

It is an arithmetic number, because the mean of its divisors is an integer number (357035904).

Almost surely, 2^2121213009 is an apocalyptic number.

It is an amenable number.

2121213009 is a deficient number, since it is larger than the sum of its proper divisors (735074223).

2121213009 is a wasteful number, since it uses less digits than its factorization.

2121213009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000807.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 2121213009 is about 46056.6282851882. The cubic root of 2121213009 is about 1284.8766219666.

The spelling of 2121213009 in words is "two billion, one hundred twenty-one million, two hundred thirteen thousand, nine".