217251872039 has 8 divisors (see below), whose sum is σ = 221080434768. Its totient is φ = 213431924160.

The previous prime is 217251872023. The next prime is 217251872053. The reversal of 217251872039 is 930278152712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 217251872039 - 2⁴ = 217251872023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217251871984 and 217251872002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217251872059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2102822 + ... + 2203715.

It is an arithmetic number, because the mean of its divisors is an integer number (27635054346).

Almost surely, 2^217251872039 is an apocalyptic number.

217251872039 is a deficient number, since it is larger than the sum of its proper divisors (3828562729).

217251872039 is an equidigital number, since it uses as much as digits as its factorization.

217251872039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307425.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 217251872039 in words is "two hundred seventeen billion, two hundred fifty-one million, eight hundred seventy-two thousand, thirty-nine".