22001020122221 has 16 divisors (see below), whose sum is σ = 25366842488064. Its totient is φ = 18690906657024.

The previous prime is 22001020122197. The next prime is 22001020122223. The reversal of 22001020122221 is 12222102010022.

It is a happy number.

It is not a de Polignac number, because 22001020122221 - 2³⁰ = 21999946380397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22001020122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001020122223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118187600 + ... + 118373606.

It is an arithmetic number, because the mean of its divisors is an integer number (1585427655504).

Almost surely, 2^{22001020122221} is an apocalyptic number.

It is an amenable number.

22001020122221 is a deficient number, since it is larger than the sum of its proper divisors (3365822365843).

22001020122221 is a wasteful number, since it uses less digits than its factorization.

22001020122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335660.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22001020122221 its reverse (12222102010022), we get a palindrome (34223122132243).

The spelling of 22001020122221 in words is "twenty-two trillion, one billion, twenty million, one hundred twenty-two thousand, two hundred twenty-one".