2121263213 has 4 divisors (see below), whose sum is σ = 2246043420. Its totient is φ = 1996483008.

The previous prime is 2121263147. The next prime is 2121263239. The reversal of 2121263213 is 3123621212.

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 1112756164 + 1008507049 = 33358^2 + 31757^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121263213 - 2¹² = 2121259117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121263413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62390078 + ... + 62390111.

It is an arithmetic number, because the mean of its divisors is an integer number (561510855).

Almost surely, 2^2121263213 is an apocalyptic number.

It is an amenable number.

2121263213 is a deficient number, since it is larger than the sum of its proper divisors (124780207).

2121263213 is a wasteful number, since it uses less digits than its factorization.

2121263213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124780206.

The product of its digits is 864, while the sum is 23.

The square root of 2121263213 is about 46057.1733066631. The cubic root of 2121263213 is about 1284.8867585311.

Adding to 2121263213 its reverse (3123621212), we get a palindrome (5244884425).

The spelling of 2121263213 in words is "two billion, one hundred twenty-one million, two hundred sixty-three thousand, two hundred thirteen".