2212211221 has 8 divisors (see below), whose sum is σ = 2414102688. Its totient is φ = 2010450000.

The previous prime is 2212211213. The next prime is 2212211227. The reversal of 2212211221 is 1221122122.

It is a happy number.

2212211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2212211221 - 2³ = 2212211213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2212211195 and 2212211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212211227) 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, 4831 + ... + 66691.

It is an arithmetic number, because the mean of its divisors is an integer number (301762836).

Almost surely, 2^2212211221 is an apocalyptic number.

It is an amenable number.

2212211221 is a deficient number, since it is larger than the sum of its proper divisors (201891467).

2212211221 is a wasteful number, since it uses less digits than its factorization.

2212211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65123.

The product of its digits is 64, while the sum is 16.

The square root of 2212211221 is about 47034.1495192589. The cubic root of 2212211221 is about 1302.9933431512.

Adding to 2212211221 its reverse (1221122122), we get a palindrome (3433333343).

It can be divided in two parts, 22 and 12211221, that multiplied together give a palindrome (268646862).

The spelling of 2212211221 in words is "two billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty-one".