276781221 has 12 divisors (see below), whose sum is σ = 405763072. Its totient is φ = 181766376.

The previous prime is 276781181. The next prime is 276781223. The reversal of 276781221 is 122187672.

It is not a de Polignac number, because 276781221 - 2⁶ = 276781157 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 (276781223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228901 + ... + 230106.

Almost surely, 2^276781221 is an apocalyptic number.

It is an amenable number.

276781221 is a deficient number, since it is larger than the sum of its proper divisors (128981851).

276781221 is a wasteful number, since it uses less digits than its factorization.

276781221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459080 (or 459077 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 276781221 is about 16636.7431007394. The cubic root of 276781221 is about 651.6967276451.

The spelling of 276781221 in words is "two hundred seventy-six million, seven hundred eighty-one thousand, two hundred twenty-one".