21008499067 has 2 divisors, whose sum is σ = 21008499068. Its totient is φ = 21008499066.

The previous prime is 21008499049. The next prime is 21008499137. The reversal of 21008499067 is 76099480012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21008499067 - 2⁷ = 21008498939 is a prime.

It is not a weakly prime, because it can be changed into another prime (21008499047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10504249533 + 10504249534.

It is an arithmetic number, because the mean of its divisors is an integer number (10504249534).

Almost surely, 2^21008499067 is an apocalyptic number.

21008499067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21008499067 is an equidigital number, since it uses as much as digits as its factorization.

21008499067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 21008499067 in words is "twenty-one billion, eight million, four hundred ninety-nine thousand, sixty-seven".