2102221221 has 8 divisors (see below), whose sum is σ = 2825032704. Its totient is φ = 1390445280.

The previous prime is 2102221213. The next prime is 2102221243. The reversal of 2102221221 is 1221222012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2102221221 - 2³ = 2102221213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2102221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102221421) 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, 2758440 + ... + 2759201.

It is an arithmetic number, because the mean of its divisors is an integer number (353129088).

Almost surely, 2^2102221221 is an apocalyptic number.

It is an amenable number.

2102221221 is a deficient number, since it is larger than the sum of its proper divisors (722811483).

2102221221 is a wasteful number, since it uses less digits than its factorization.

2102221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5517771.

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

The square root of 2102221221 is about 45849.9860523425. The cubic root of 2102221221 is about 1281.0305057877.

Adding to 2102221221 its reverse (1221222012), we get a palindrome (3323443233).

The spelling of 2102221221 in words is "two billion, one hundred two million, two hundred twenty-one thousand, two hundred twenty-one".