2012321221 has 4 divisors (see below), whose sum is σ = 2099813472. Its totient is φ = 1924828972.

The previous prime is 2012321219. The next prime is 2012321231. The reversal of 2012321221 is 1221232102.

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 2012321221 - 2¹ = 2012321219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012321195 and 2012321204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012321231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43746091 + ... + 43746136.

It is an arithmetic number, because the mean of its divisors is an integer number (524953368).

Almost surely, 2^2012321221 is an apocalyptic number.

It is an amenable number.

2012321221 is a deficient number, since it is larger than the sum of its proper divisors (87492251).

2012321221 is an equidigital number, since it uses as much as digits as its factorization.

2012321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87492250.

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

The square root of 2012321221 is about 44858.9034752300. The cubic root of 2012321221 is about 1262.5030491839.

Adding to 2012321221 its reverse (1221232102), we get a palindrome (3233553323).

The spelling of 2012321221 in words is "two billion, twelve million, three hundred twenty-one thousand, two hundred twenty-one".