2121010221 has 8 divisors (see below), whose sum is σ = 3085105824. Its totient is φ = 1285460720.

The previous prime is 2121010211. The next prime is 2121010247. The reversal of 2121010221 is 1220101212.

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 2121010221 - 2⁵ = 2121010189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121010197 and 2121010206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121010211) 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, 32136486 + ... + 32136551.

It is an arithmetic number, because the mean of its divisors is an integer number (385638228).

Almost surely, 2^2121010221 is an apocalyptic number.

It is an amenable number.

2121010221 is a deficient number, since it is larger than the sum of its proper divisors (964095603).

2121010221 is a wasteful number, since it uses less digits than its factorization.

2121010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64273051.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2121010221 is about 46054.4267253431. The cubic root of 2121010221 is about 1284.8356759194.

Adding to 2121010221 its reverse (1220101212), we get a palindrome (3341111433).

Subtracting from 2121010221 its reverse (1220101212), we obtain a palindrome (900909009).

The spelling of 2121010221 in words is "two billion, one hundred twenty-one million, ten thousand, two hundred twenty-one".