2121203213 has 8 divisors (see below), whose sum is σ = 2140317432. Its totient is φ = 2102173696.

The previous prime is 2121203209. The next prime is 2121203219. The reversal of 2121203213 is 3123021212.

It can be written as a sum of positive squares in 4 ways, for example, as 1758795844 + 362407369 = 41938^2 + 19037^2 .

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 2121203213 - 2² = 2121203209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121203191 and 2121203200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121203219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29681 + ... + 71577.

It is an arithmetic number, because the mean of its divisors is an integer number (267539679).

Almost surely, 2^2121203213 is an apocalyptic number.

It is an amenable number.

2121203213 is a deficient number, since it is larger than the sum of its proper divisors (19114219).

2121203213 is a wasteful number, since it uses less digits than its factorization.

2121203213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42351.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2121203213 is about 46056.5219377234. The cubic root of 2121203213 is about 1284.8746440620.

Adding to 2121203213 its reverse (3123021212), we get a palindrome (5244224425).

The spelling of 2121203213 in words is "two billion, one hundred twenty-one million, two hundred three thousand, two hundred thirteen".