21276494093 has 2 divisors, whose sum is σ = 21276494094. Its totient is φ = 21276494092.

The previous prime is 21276494077. The next prime is 21276494131. The reversal of 21276494093 is 39049467212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12723388804 + 8553105289 = 112798^2 + 92483^2 .

It is a cyclic number.

It is not a de Polignac number, because 21276494093 - 2⁴ = 21276494077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21276494053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10638247046 + 10638247047.

It is an arithmetic number, because the mean of its divisors is an integer number (10638247047).

Almost surely, 2^21276494093 is an apocalyptic number.

It is an amenable number.

21276494093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21276494093 is an equidigital number, since it uses as much as digits as its factorization.

21276494093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 21276494093 in words is "twenty-one billion, two hundred seventy-six million, four hundred ninety-four thousand, ninety-three".