1017200521 has 4 divisors (see below), whose sum is σ = 1017330192. Its totient is φ = 1017070852.

The previous prime is 1017200519. The next prime is 1017200537. The reversal of 1017200521 is 1250027101.

It is the 13021-st star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1250027101 = 53 ⋅23585417.

It is a cyclic number.

It is not a de Polignac number, because 1017200521 - 2¹ = 1017200519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1017200021) 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, 52255 + ... + 69028.

It is an arithmetic number, because the mean of its divisors is an integer number (254332548).

Almost surely, 2^1017200521 is an apocalyptic number.

It is an amenable number.

1017200521 is a deficient number, since it is larger than the sum of its proper divisors (129671).

1017200521 is an equidigital number, since it uses as much as digits as its factorization.

1017200521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129670.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 1017200521 is about 31893.5811880698. The cubic root of 1017200521 is about 1005.7009444705.

Adding to 1017200521 its reverse (1250027101), we get a palindrome (2267227622).

The spelling of 1017200521 in words is "one billion, seventeen million, two hundred thousand, five hundred twenty-one".