17021012021 has 8 divisors (see below), whose sum is σ = 18962401080. Its totient is φ = 15169920192.

The previous prime is 17021011991. The next prime is 17021012033. The reversal of 17021012021 is 12021012071.

It can be written as a sum of positive squares in 4 ways, for example, as 52041796 + 16968970225 = 7214^2 + 130265^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17021012021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17021012321) 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, 22573910 + ... + 22574663.

It is an arithmetic number, because the mean of its divisors is an integer number (2370300135).

Almost surely, 2^17021012021 is an apocalyptic number.

It is an amenable number.

17021012021 is a deficient number, since it is larger than the sum of its proper divisors (1941389059).

17021012021 is a wasteful number, since it uses less digits than its factorization.

17021012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45148615.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 17021012021 its reverse (12021012071), we get a palindrome (29042024092).

The spelling of 17021012021 in words is "seventeen billion, twenty-one million, twelve thousand, twenty-one".