8420815403291 has 2 divisors, whose sum is σ = 8420815403292. Its totient is φ = 8420815403290.

The previous prime is 8420815403261. The next prime is 8420815403293. The reversal of 8420815403291 is 1923045180248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8420815403291 - 2²² = 8420811208987 is a prime.

Together with 8420815403293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8420815403293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210407701645 + 4210407701646.

It is an arithmetic number, because the mean of its divisors is an integer number (4210407701646).

Almost surely, 2^{8420815403291} is an apocalyptic number.

8420815403291 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420815403291 is an equidigital number, since it uses as much as digits as its factorization.

8420815403291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 8420815403291 in words is "eight trillion, four hundred twenty billion, eight hundred fifteen million, four hundred three thousand, two hundred ninety-one".