2123773213 has 4 divisors (see below), whose sum is σ = 2132037180. Its totient is φ = 2115509248.

The previous prime is 2123773199. The next prime is 2123773219. The reversal of 2123773213 is 3123773212.

It is a happy number.

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 1747490809 + 376282404 = 41803^2 + 19398^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123773213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123773219) 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, 4131598 + ... + 4132111.

It is an arithmetic number, because the mean of its divisors is an integer number (533009295).

Almost surely, 2^2123773213 is an apocalyptic number.

It is an amenable number.

2123773213 is a deficient number, since it is larger than the sum of its proper divisors (8263967).

2123773213 is an equidigital number, since it uses as much as digits as its factorization.

2123773213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8263966.

The product of its digits is 10584, while the sum is 31.

The square root of 2123773213 is about 46084.4139921514. The cubic root of 2123773213 is about 1285.3933426193.

Subtracting 2123773213 from its reverse (3123773212), we obtain a palindrome (999999999).

The spelling of 2123773213 in words is "two billion, one hundred twenty-three million, seven hundred seventy-three thousand, two hundred thirteen".