21008210467 has 2 divisors, whose sum is σ = 21008210468. Its totient is φ = 21008210466.

The previous prime is 21008210459. The next prime is 21008210507. The reversal of 21008210467 is 76401280012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21008210467 - 2³ = 21008210459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21008810467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10504105233 + 10504105234.

It is an arithmetic number, because the mean of its divisors is an integer number (10504105234).

Almost surely, 2^21008210467 is an apocalyptic number.

21008210467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21008210467 is an equidigital number, since it uses as much as digits as its factorization.

21008210467 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

Adding to 21008210467 its reverse (76401280012), we get a palindrome (97409490479).

The spelling of 21008210467 in words is "twenty-one billion, eight million, two hundred ten thousand, four hundred sixty-seven".