2106859521 has 32 divisors (see below), whose sum is σ = 3207714048. Its totient is φ = 1218539520.

The previous prime is 2106859511. The next prime is 2106859549. The reversal of 2106859521 is 1259586012.

It is not a de Polignac number, because 2106859521 - 2⁷ = 2106859393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 2106859521.

It is not an unprimeable number, because it can be changed into a prime (2106859511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 582300 + ... + 585906.

It is an arithmetic number, because the mean of its divisors is an integer number (100241064).

Almost surely, 2^2106859521 is an apocalyptic number.

It is an amenable number.

2106859521 is a deficient number, since it is larger than the sum of its proper divisors (1100854527).

2106859521 is a wasteful number, since it uses less digits than its factorization.

2106859521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4521.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 2106859521 is about 45900.5394412745. The cubic root of 2106859521 is about 1281.9719606521.

The spelling of 2106859521 in words is "two billion, one hundred six million, eight hundred fifty-nine thousand, five hundred twenty-one".