2121020110221 has 8 divisors (see below), whose sum is σ = 2842833237504. Its totient is φ = 1406610194880.

The previous prime is 2121020110193. The next prime is 2121020110247. The reversal of 2121020110221 is 1220110201212.

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

It is not a de Polignac number, because 2121020110221 - 2¹³ = 2121020102029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121020110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121020110021) 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, 1850802316 + ... + 1850803461.

It is an arithmetic number, because the mean of its divisors is an integer number (355354154688).

Almost surely, 2^{2121020110221} is an apocalyptic number.

It is an amenable number.

2121020110221 is a deficient number, since it is larger than the sum of its proper divisors (721813127283).

2121020110221 is a wasteful number, since it uses less digits than its factorization.

2121020110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701605971.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2121020110221 its reverse (1220110201212), we get a palindrome (3341130311433).

Subtracting from 2121020110221 its reverse (1220110201212), we obtain a palindrome (900909909009).

The spelling of 2121020110221 in words is "two trillion, one hundred twenty-one billion, twenty million, one hundred ten thousand, two hundred twenty-one".