2212021221 has 8 divisors (see below), whose sum is σ = 2957578560. Its totient is φ = 1470572352.

The previous prime is 2212021187. The next prime is 2212021261. The reversal of 2212021221 is 1221202122.

2212021221 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 not a de Polignac number, because 2212021221 - 2¹⁰ = 2212020197 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2212021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212021261) 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, 1025860 + ... + 1028013.

It is an arithmetic number, because the mean of its divisors is an integer number (369697320).

Almost surely, 2^2212021221 is an apocalyptic number.

It is an amenable number.

2212021221 is a deficient number, since it is larger than the sum of its proper divisors (745557339).

2212021221 is a wasteful number, since it uses less digits than its factorization.

2212021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054235.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2212021221 is about 47032.1296668565. The cubic root of 2212021221 is about 1302.9560387232.

Adding to 2212021221 its reverse (1221202122), we get a palindrome (3433223343).

The spelling of 2212021221 in words is "two billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".