2012243521 has 4 divisors (see below), whose sum is σ = 2012759344. Its totient is φ = 2011727700.

The previous prime is 2012243501. The next prime is 2012243537. The reversal of 2012243521 is 1253422102.

It is a happy 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.

It is a cyclic number.

It is not a de Polignac number, because 2012243521 - 2¹⁷ = 2012112449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012243492 and 2012243501.

It is not an unprimeable number, because it can be changed into a prime (2012243501) 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, 252015 + ... + 259876.

It is an arithmetic number, because the mean of its divisors is an integer number (503189836).

Almost surely, 2^2012243521 is an apocalyptic number.

It is an amenable number.

2012243521 is a deficient number, since it is larger than the sum of its proper divisors (515823).

2012243521 is an equidigital number, since it uses as much as digits as its factorization.

2012243521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515822.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2012243521 is about 44858.0374180592. The cubic root of 2012243521 is about 1262.4867996659.

Adding to 2012243521 its reverse (1253422102), we get a palindrome (3265665623).

The spelling of 2012243521 in words is "two billion, twelve million, two hundred forty-three thousand, five hundred twenty-one".