21407316456767 has 2 divisors, whose sum is σ = 21407316456768. Its totient is φ = 21407316456766.

The previous prime is 21407316456703. The next prime is 21407316456769. The reversal of 21407316456767 is 76765461370412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21407316456767 - 2⁶ = 21407316456703 is a prime.

Together with 21407316456769, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21407316456769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703658228383 + 10703658228384.

It is an arithmetic number, because the mean of its divisors is an integer number (10703658228384).

Almost surely, 2^{21407316456767} is an apocalyptic number.

21407316456767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21407316456767 is an equidigital number, since it uses as much as digits as its factorization.

21407316456767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35562240, while the sum is 59.

The spelling of 21407316456767 in words is "twenty-one trillion, four hundred seven billion, three hundred sixteen million, four hundred fifty-six thousand, seven hundred sixty-seven".