2212121110221 has 96 divisors (see below), whose sum is σ = 3702816599040. Its totient is φ = 1259853004800.

The previous prime is 2212121110181. The next prime is 2212121110223. The reversal of 2212121110221 is 1220111212122.

2212121110221 is a `hidden beast` number, since 2 + 212 + 121 + 110 + 221 = 666.

It is not a de Polignac number, because 2212121110221 - 2¹⁰ = 2212121109197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2212121110194 and 2212121110203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212121110223) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 57779341 + ... + 57817613.

It is an arithmetic number, because the mean of its divisors is an integer number (38571006240).

Almost surely, 2^{2212121110221} is an apocalyptic number.

It is an amenable number.

2212121110221 is a deficient number, since it is larger than the sum of its proper divisors (1490695488819).

2212121110221 is a wasteful number, since it uses less digits than its factorization.

2212121110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38867 (or 38864 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2212121110221 its reverse (1220111212122), we get a palindrome (3432232322343).

The spelling of 2212121110221 in words is "two trillion, two hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, two hundred twenty-one".