22001021122221 has 12 divisors (see below), whose sum is σ = 31779947515680. Its totient is φ = 14667026745480.

The previous prime is 22001021122183. The next prime is 22001021122247. The reversal of 22001021122221 is 12222112010022.

It is a happy number.

22001021122221 is a `hidden beast` number, since 2 + 200 + 10 + 211 + 22 + 221 = 666.

It is not a de Polignac number, because 22001021122221 - 2¹³ = 22001021114029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22001021122194 and 22001021122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001021122291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26287545 + ... + 27111566.

It is an arithmetic number, because the mean of its divisors is an integer number (2648328959640).

Almost surely, 2^{22001021122221} is an apocalyptic number.

It is an amenable number.

22001021122221 is a deficient number, since it is larger than the sum of its proper divisors (9778926393459).

22001021122221 is a wasteful number, since it uses less digits than its factorization.

22001021122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53444896 (or 53444893 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22001021122221 its reverse (12222112010022), we get a palindrome (34223133132243).

The spelling of 22001021122221 in words is "twenty-two trillion, one billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".