21100079243 has 2 divisors, whose sum is σ = 21100079244. Its totient is φ = 21100079242.

The previous prime is 21100079233. The next prime is 21100079267. The reversal of 21100079243 is 34297000112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100079243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100079233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550039621 + 10550039622.

It is an arithmetic number, because the mean of its divisors is an integer number (10550039622).

Almost surely, 2^21100079243 is an apocalyptic number.

21100079243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100079243 is an equidigital number, since it uses as much as digits as its factorization.

21100079243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

Adding to 21100079243 its reverse (34297000112), we get a palindrome (55397079355).

The spelling of 21100079243 in words is "twenty-one billion, one hundred million, seventy-nine thousand, two hundred forty-three".