276990221 has 4 divisors (see below), whose sum is σ = 277411200. Its totient is φ = 276569244.

The previous prime is 276990209. The next prime is 276990229. The reversal of 276990221 is 122099672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 276990221 - 2⁶ = 276990157 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 (276990229) 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, 209501 + ... + 210818.

It is an arithmetic number, because the mean of its divisors is an integer number (69352800).

Almost surely, 2^276990221 is an apocalyptic number.

It is an amenable number.

276990221 is a deficient number, since it is larger than the sum of its proper divisors (420979).

276990221 is an equidigital number, since it uses as much as digits as its factorization.

276990221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420978.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 276990221 is about 16643.0231929178. The cubic root of 276990221 is about 651.8607204030.

The spelling of 276990221 in words is "two hundred seventy-six million, nine hundred ninety thousand, two hundred twenty-one".