812204402217 has 64 divisors (see below), whose sum is σ = 1257212608512. Its totient is φ = 462293568000.

The previous prime is 812204402213. The next prime is 812204402221. The reversal of 812204402217 is 712204402218.

It is an interprime number because it is at equal distance from previous prime (812204402213) and next prime (812204402221).

It is not a de Polignac number, because 812204402217 - 2² = 812204402213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (812204402213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36721992 + ... + 36744102.

It is an arithmetic number, because the mean of its divisors is an integer number (19643947008).

Almost surely, 2^812204402217 is an apocalyptic number.

It is an amenable number.

812204402217 is a deficient number, since it is larger than the sum of its proper divisors (445008206295).

812204402217 is a wasteful number, since it uses less digits than its factorization.

812204402217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23502.

The product of its (nonzero) digits is 14336, while the sum is 33.

Subtracting from 812204402217 its reverse (712204402218), we obtain a palindrome (99999999999).

The spelling of 812204402217 in words is "eight hundred twelve billion, two hundred four million, four hundred two thousand, two hundred seventeen".