21420884823467 has 2 divisors, whose sum is σ = 21420884823468. Its totient is φ = 21420884823466.

The previous prime is 21420884823431. The next prime is 21420884823511. The reversal of 21420884823467 is 76432848802412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21420884823467 - 2⁸ = 21420884823211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21420884823067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710442411733 + 10710442411734.

It is an arithmetic number, because the mean of its divisors is an integer number (10710442411734).

Almost surely, 2^{21420884823467} is an apocalyptic number.

21420884823467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420884823467 is an equidigital number, since it uses as much as digits as its factorization.

21420884823467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33030144, while the sum is 59.

The spelling of 21420884823467 in words is "twenty-one trillion, four hundred twenty billion, eight hundred eighty-four million, eight hundred twenty-three thousand, four hundred sixty-seven".