21293906467 has 2 divisors, whose sum is σ = 21293906468. Its totient is φ = 21293906466.

The previous prime is 21293906453. The next prime is 21293906489. The reversal of 21293906467 is 76460939212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21293906467 - 2¹¹ = 21293904419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21293906467.

It is not a weakly prime, because it can be changed into another prime (21293903467) 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, 10646953233 + 10646953234.

It is an arithmetic number, because the mean of its divisors is an integer number (10646953234).

Almost surely, 2^21293906467 is an apocalyptic number.

21293906467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21293906467 is an equidigital number, since it uses as much as digits as its factorization.

21293906467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 21293906467 in words is "twenty-one billion, two hundred ninety-three million, nine hundred six thousand, four hundred sixty-seven".