2731307021 has 2 divisors, whose sum is σ = 2731307022. Its totient is φ = 2731307020.

The previous prime is 2731307003. The next prime is 2731307041. The reversal of 2731307021 is 1207031372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1813822921 + 917484100 = 42589^2 + 30290^2 .

It is a cyclic number.

It is not a de Polignac number, because 2731307021 - 2⁶ = 2731306957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2731307041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365653510 + 1365653511.

It is an arithmetic number, because the mean of its divisors is an integer number (1365653511).

Almost surely, 2^2731307021 is an apocalyptic number.

It is an amenable number.

2731307021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2731307021 is an equidigital number, since it uses as much as digits as its factorization.

2731307021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 2731307021 is about 52261.9079349386. The cubic root of 2731307021 is about 1397.8379930535.

Adding to 2731307021 its reverse (1207031372), we get a palindrome (3938338393).

The spelling of 2731307021 in words is "two billion, seven hundred thirty-one million, three hundred seven thousand, twenty-one".