2012312221 has 4 divisors (see below), whose sum is σ = 2025638944. Its totient is φ = 1998985500.

The previous prime is 2012312201. The next prime is 2012312227. The reversal of 2012312221 is 1222132102.

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 2012312221 - 2¹⁹ = 2011787933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012312195 and 2012312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012312227) 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, 6663135 + ... + 6663436.

It is an arithmetic number, because the mean of its divisors is an integer number (506409736).

Almost surely, 2^2012312221 is an apocalyptic number.

It is an amenable number.

2012312221 is a deficient number, since it is larger than the sum of its proper divisors (13326723).

2012312221 is a wasteful number, since it uses less digits than its factorization.

2012312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13326722.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2012312221 is about 44858.8031605838. The cubic root of 2012312221 is about 1262.5011670218.

Adding to 2012312221 its reverse (1222132102), we get a palindrome (3234444323).

The spelling of 2012312221 in words is "two billion, twelve million, three hundred twelve thousand, two hundred twenty-one".