21000068371 has 2 divisors, whose sum is σ = 21000068372. Its totient is φ = 21000068370.

The previous prime is 21000068357. The next prime is 21000068399. The reversal of 21000068371 is 17386000012.

It is an a-pointer prime, because the next prime (21000068399) can be obtained adding 21000068371 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000068371 - 2⁵ = 21000068339 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000068311) 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, 10500034185 + 10500034186.

It is an arithmetic number, because the mean of its divisors is an integer number (10500034186).

Almost surely, 2^21000068371 is an apocalyptic number.

21000068371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000068371 is an equidigital number, since it uses as much as digits as its factorization.

21000068371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 21000068371 its reverse (17386000012), we get a palindrome (38386068383).

The spelling of 21000068371 in words is "twenty-one billion, sixty-eight thousand, three hundred seventy-one".