2121102221 has 16 divisors (see below), whose sum is σ = 2558006400. Its totient is φ = 1718143488.

The previous prime is 2121102197. The next prime is 2121102227. The reversal of 2121102221 is 1222011212.

It is a cyclic number.

It is not a de Polignac number, because 2121102221 - 2¹⁰ = 2121101197 is a prime.

It is a super-2 number, since 2×2121102221² = 8998149263862265682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121102196 and 2121102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121102227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34901 + ... + 73893.

It is an arithmetic number, because the mean of its divisors is an integer number (159875400).

Almost surely, 2^2121102221 is an apocalyptic number.

It is an amenable number.

2121102221 is a deficient number, since it is larger than the sum of its proper divisors (436904179).

2121102221 is a wasteful number, since it uses less digits than its factorization.

2121102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39428.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2121102221 is about 46055.4255327209. The cubic root of 2121102221 is about 1284.8542524719.

Adding to 2121102221 its reverse (1222011212), we get a palindrome (3343113433).

The spelling of 2121102221 in words is "two billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-one".