2756281221 has 12 divisors (see below), whose sum is σ = 4035834348. Its totient is φ = 1812348864.

The previous prime is 2756281163. The next prime is 2756281223. The reversal of 2756281221 is 1221826572.

It is a happy number.

2756281221 is a `hidden beast` number, since 2 + 7 + 5 + 628 + 1 + 2 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 938196900 + 1818084321 = 30630^2 + 42639^2 .

It is not a de Polignac number, because 2756281221 - 2¹⁴ = 2756264837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2756281223) 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, 2096970 + ... + 2098283.

It is an arithmetic number, because the mean of its divisors is an integer number (336319529).

Almost surely, 2^2756281221 is an apocalyptic number.

It is an amenable number.

2756281221 is a deficient number, since it is larger than the sum of its proper divisors (1279553127).

2756281221 is a wasteful number, since it uses less digits than its factorization.

2756281221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195332 (or 4195329 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 2756281221 is about 52500.2973420151. The cubic root of 2756281221 is about 1402.0855347309.

The spelling of 2756281221 in words is "two billion, seven hundred fifty-six million, two hundred eighty-one thousand, two hundred twenty-one".