2121202010221 has 8 divisors (see below), whose sum is σ = 2458374966144. Its totient is φ = 1792565078640.

The previous prime is 2121202010189. The next prime is 2121202010227. The reversal of 2121202010221 is 1220102021212.

It is a happy number.

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

It is not a de Polignac number, because 2121202010221 - 2⁵ = 2121202010189 is a prime.

It is a super-2 number, since 2×2121202010221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121202010195 and 2121202010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121202010227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2134005550 + ... + 2134006543.

It is an arithmetic number, because the mean of its divisors is an integer number (307296870768).

Almost surely, 2^{2121202010221} is an apocalyptic number.

It is an amenable number.

2121202010221 is a deficient number, since it is larger than the sum of its proper divisors (337172955923).

2121202010221 is an equidigital number, since it uses as much as digits as its factorization.

2121202010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268012171.

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

Adding to 2121202010221 its reverse (1220102021212), we get a palindrome (3341304031433).

The spelling of 2121202010221 in words is "two trillion, one hundred twenty-one billion, two hundred two million, ten thousand, two hundred twenty-one".