22101221011221 has 18 divisors (see below), whose sum is σ = 35090001037910. Its totient is φ = 13394679400080.

The previous prime is 22101221011187. The next prime is 22101221011229. The reversal of 22101221011221 is 12211012210122.

22101221011221 is a `hidden beast` number, since 2 + 210 + 1 + 221 + 0 + 11 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21655015715025 + 446205296196 = 4653495^2 + 667986^2 .

It is not a de Polignac number, because 22101221011221 - 2²¹ = 22101218914069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101221011194 and 22101221011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101221011229) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10147483306 + ... + 10147485483.

Almost surely, 2^{22101221011221} is an apocalyptic number.

It is an amenable number.

22101221011221 is a deficient number, since it is larger than the sum of its proper divisors (12988780026689).

22101221011221 is a wasteful number, since it uses less digits than its factorization.

22101221011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20294968817 (or 20294968803 counting only the distinct ones).

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

Adding to 22101221011221 its reverse (12211012210122), we get a palindrome (34312233221343).

The spelling of 22101221011221 in words is "twenty-two trillion, one hundred one billion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".