421915478297 has 2 divisors, whose sum is σ = 421915478298. Its totient is φ = 421915478296.

The previous prime is 421915478291. The next prime is 421915478353. The reversal of 421915478297 is 792874519124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270104720656 + 151810757641 = 519716^2 + 389629^2 .

It is a cyclic number.

It is not a de Polignac number, because 421915478297 - 2¹⁰ = 421915477273 is a prime.

It is not a weakly prime, because it can be changed into another prime (421915478291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210957739148 + 210957739149.

It is an arithmetic number, because the mean of its divisors is an integer number (210957739149).

Almost surely, 2^421915478297 is an apocalyptic number.

It is an amenable number.

421915478297 is a deficient number, since it is larger than the sum of its proper divisors (1).

421915478297 is an equidigital number, since it uses as much as digits as its factorization.

421915478297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 59.

The spelling of 421915478297 in words is "four hundred twenty-one billion, nine hundred fifteen million, four hundred seventy-eight thousand, two hundred ninety-seven".