2012106521 has 8 divisors (see below), whose sum is σ = 2018423880. Its totient is φ = 2005800192.

The previous prime is 2012106433. The next prime is 2012106527. The reversal of 2012106521 is 1256012102.

It can be written as a sum of positive squares in 4 ways, for example, as 373880896 + 1638225625 = 19336^2 + 40475^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2012106521 - 2¹⁴ = 2012090137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012106493 and 2012106502.

It is not an unprimeable number, because it can be changed into a prime (2012106527) 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, 489551 + ... + 493643.

It is an arithmetic number, because the mean of its divisors is an integer number (252302985).

Almost surely, 2^2012106521 is an apocalyptic number.

It is an amenable number.

2012106521 is a deficient number, since it is larger than the sum of its proper divisors (6317359).

2012106521 is an equidigital number, since it uses as much as digits as its factorization.

2012106521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5515.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2012106521 is about 44856.5103524561. The cubic root of 2012106521 is about 1262.4581476307.

Adding to 2012106521 its reverse (1256012102), we get a palindrome (3268118623).

The spelling of 2012106521 in words is "two billion, twelve million, one hundred six thousand, five hundred twenty-one".