2756438221 has 2 divisors, whose sum is σ = 2756438222. Its totient is φ = 2756438220.

The previous prime is 2756438213. The next prime is 2756438239. The reversal of 2756438221 is 1228346572.

2756438221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2744292996 + 12145225 = 52386^2 + 3485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2756438221 - 2³ = 2756438213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2756438261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1378219110 + 1378219111.

It is an arithmetic number, because the mean of its divisors is an integer number (1378219111).

Almost surely, 2^2756438221 is an apocalyptic number.

It is an amenable number.

2756438221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2756438221 is an equidigital number, since it uses as much as digits as its factorization.

2756438221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 40.

The square root of 2756438221 is about 52501.7925503501. The cubic root of 2756438221 is about 1402.1121555328.

The spelling of 2756438221 in words is "two billion, seven hundred fifty-six million, four hundred thirty-eight thousand, two hundred twenty-one".