2681278421 has 2 divisors, whose sum is σ = 2681278422. Its totient is φ = 2681278420.

The previous prime is 2681278357. The next prime is 2681278463. The reversal of 2681278421 is 1248721862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2217091396 + 464187025 = 47086^2 + 21545^2 .

It is a cyclic number.

It is not a de Polignac number, because 2681278421 - 2⁶ = 2681278357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2681278121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340639210 + 1340639211.

It is an arithmetic number, because the mean of its divisors is an integer number (1340639211).

Almost surely, 2^2681278421 is an apocalyptic number.

It is an amenable number.

2681278421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2681278421 is an equidigital number, since it uses as much as digits as its factorization.

2681278421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 41.

The square root of 2681278421 is about 51781.0623780548. The cubic root of 2681278421 is about 1389.2507427910.

The spelling of 2681278421 in words is "two billion, six hundred eighty-one million, two hundred seventy-eight thousand, four hundred twenty-one".