217913900001 has 36 divisors (see below), whose sum is σ = 338579417232. Its totient is φ = 124304959296.

The previous prime is 217913899991. The next prime is 217913900041. The reversal of 217913900001 is 100009319712.

It is not a de Polignac number, because 217913900001 - 2⁶ = 217913899937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (217913900041) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 187371646 + ... + 187372808.

It is an arithmetic number, because the mean of its divisors is an integer number (9404983812).

Almost surely, 2^217913900001 is an apocalyptic number.

217913900001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

217913900001 is a deficient number, since it is larger than the sum of its proper divisors (120665517231).

217913900001 is an equidigital number, since it uses as much as digits as its factorization.

217913900001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 33.

The spelling of 217913900001 in words is "two hundred seventeen billion, nine hundred thirteen million, nine hundred thousand, one".