17021472857 has 4 divisors (see below), whose sum is σ = 17023582116. Its totient is φ = 17019363600.

The previous prime is 17021472847. The next prime is 17021472899. The reversal of 17021472857 is 75827412071.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16114017481 + 907455376 = 126941^2 + 30124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17021472857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17021472847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1042478 + ... + 1058679.

It is an arithmetic number, because the mean of its divisors is an integer number (4255895529).

Almost surely, 2^17021472857 is an apocalyptic number.

It is an amenable number.

17021472857 is a deficient number, since it is larger than the sum of its proper divisors (2109259).

17021472857 is an equidigital number, since it uses as much as digits as its factorization.

17021472857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109258.

The product of its (nonzero) digits is 219520, while the sum is 44.

The spelling of 17021472857 in words is "seventeen billion, twenty-one million, four hundred seventy-two thousand, eight hundred fifty-seven".