2221021111221 has 48 divisors (see below), whose sum is σ = 3687006435840. Its totient is φ = 1274183408160.

The previous prime is 2221021111189. The next prime is 2221021111223. The reversal of 2221021111221 is 1221111201222.

2221021111221 is a `hidden beast` number, since 2 + 221 + 0 + 211 + 11 + 221 = 666.

It is not a de Polignac number, because 2221021111221 - 2⁵ = 2221021111189 is a prime.

It is a super-2 number, since 2×2221021111221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2221021111194 and 2221021111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221021111223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1817730 + ... + 2783196.

It is an arithmetic number, because the mean of its divisors is an integer number (76812634080).

Almost surely, 2^{2221021111221} is an apocalyptic number.

It is an amenable number.

2221021111221 is a deficient number, since it is larger than the sum of its proper divisors (1465985324619).

2221021111221 is a wasteful number, since it uses less digits than its factorization.

2221021111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966726 (or 966723 counting only the distinct ones).

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

Adding to 2221021111221 its reverse (1221111201222), we get a palindrome (3442132312443).

Subtracting from 2221021111221 its reverse (1221111201222), we obtain a palindrome (999909909999).

The spelling of 2221021111221 in words is "two trillion, two hundred twenty-one billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".