21222122221101 has 32 divisors (see below), whose sum is σ = 30994341759360. Its totient is φ = 12856436762624.

The previous prime is 21222122221051. The next prime is 21222122221103. The reversal of 21222122221101 is 10112222122212.

It is a cyclic number.

It is not a de Polignac number, because 21222122221101 - 2⁹ = 21222122220589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222122221103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111840361 + ... + 112029953.

It is an arithmetic number, because the mean of its divisors is an integer number (968573179980).

Almost surely, 2^{21222122221101} is an apocalyptic number.

It is an amenable number.

21222122221101 is a deficient number, since it is larger than the sum of its proper divisors (9772219538259).

21222122221101 is a wasteful number, since it uses less digits than its factorization.

21222122221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265325.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222122221101 its reverse (10112222122212), we get a palindrome (31334344343313).

The spelling of 21222122221101 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred one".