2155124213 has 16 divisors (see below), whose sum is σ = 2398087296. Its totient is φ = 1920085440.

The previous prime is 2155124207. The next prime is 2155124227. The reversal of 2155124213 is 3124215512.

It is a cyclic number.

It is not a de Polignac number, because 2155124213 - 2⁴ = 2155124197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155124113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 758231 + ... + 761067.

It is an arithmetic number, because the mean of its divisors is an integer number (149880456).

Almost surely, 2^2155124213 is an apocalyptic number.

It is an amenable number.

2155124213 is a deficient number, since it is larger than the sum of its proper divisors (242963083).

2155124213 is a wasteful number, since it uses less digits than its factorization.

2155124213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4204.

The product of its digits is 2400, while the sum is 26.

The square root of 2155124213 is about 46423.3154029309. The cubic root of 2155124213 is about 1291.6874363713.

Adding to 2155124213 its reverse (3124215512), we get a palindrome (5279339725).

The spelling of 2155124213 in words is "two billion, one hundred fifty-five million, one hundred twenty-four thousand, two hundred thirteen".