276721213 has 8 divisors (see below), whose sum is σ = 278736696. Its totient is φ = 274713600.

The previous prime is 276721183. The next prime is 276721229. The reversal of 276721213 is 312127672.

It can be written as a sum of positive squares in 4 ways, for example, as 166848889 + 109872324 = 12917^2 + 10482^2 .

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 276721213 - 2⁹ = 276720701 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 (276721273) 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, 80653 + ... + 84013.

It is an arithmetic number, because the mean of its divisors is an integer number (34842087).

Almost surely, 2^276721213 is an apocalyptic number.

It is an amenable number.

276721213 is a deficient number, since it is larger than the sum of its proper divisors (2015483).

276721213 is a wasteful number, since it uses less digits than its factorization.

276721213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935.

The product of its digits is 7056, while the sum is 31.

The square root of 276721213 is about 16634.9395249878. The cubic root of 276721213 is about 651.6496268535.

Adding to 276721213 its reverse (312127672), we get a palindrome (588848885).

The spelling of 276721213 in words is "two hundred seventy-six million, seven hundred twenty-one thousand, two hundred thirteen".