2085986521 has 4 divisors (see below), whose sum is σ = 2089231312. Its totient is φ = 2082741732.

The previous prime is 2085986489. The next prime is 2085986549. The reversal of 2085986521 is 1256895802.

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: 1256895802 = 2 ⋅628447901.

It is a cyclic number.

It is not a de Polignac number, because 2085986521 - 2⁵ = 2085986489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2085986321) 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, 1621431 + ... + 1622716.

It is an arithmetic number, because the mean of its divisors is an integer number (522307828).

Almost surely, 2^2085986521 is an apocalyptic number.

It is an amenable number.

2085986521 is a deficient number, since it is larger than the sum of its proper divisors (3244791).

2085986521 is an equidigital number, since it uses as much as digits as its factorization.

2085986521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244790.

The product of its (nonzero) digits is 345600, while the sum is 46.

The square root of 2085986521 is about 45672.6014258001. The cubic root of 2085986521 is about 1277.7243340551.

The spelling of 2085986521 in words is "two billion, eighty-five million, nine hundred eighty-six thousand, five hundred twenty-one".