2121410221 has 16 divisors (see below), whose sum is σ = 2531303424. Its totient is φ = 1738314864.

The previous prime is 2121410143. The next prime is 2121410231. The reversal of 2121410221 is 1220141212.

It is a cyclic number.

It is not a de Polignac number, because 2121410221 - 2⁹ = 2121409709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121410195 and 2121410204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121410231) 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, 474820 + ... + 479266.

It is an arithmetic number, because the mean of its divisors is an integer number (158206464).

Almost surely, 2^2121410221 is an apocalyptic number.

It is an amenable number.

2121410221 is a deficient number, since it is larger than the sum of its proper divisors (409893203).

2121410221 is a wasteful number, since it uses less digits than its factorization.

2121410221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7440.

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

The square root of 2121410221 is about 46058.7692084797. The cubic root of 2121410221 is about 1284.9164396299.

Adding to 2121410221 its reverse (1220141212), we get a palindrome (3341551433).

The spelling of 2121410221 in words is "two billion, one hundred twenty-one million, four hundred ten thousand, two hundred twenty-one".