22121012211221 has 16 divisors (see below), whose sum is σ = 28220826213888. Its totient is φ = 16836288361200.

The previous prime is 22121012211203. The next prime is 22121012211359. The reversal of 22121012211221 is 12211221012122.

It is a de Polignac number, because none of the positive numbers 2^k-22121012211221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121012211193 and 22121012211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121012211521) 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, 3340530095 + ... + 3340536716.

It is an arithmetic number, because the mean of its divisors is an integer number (1763801638368).

Almost surely, 2^{22121012211221} is an apocalyptic number.

It is an amenable number.

22121012211221 is a deficient number, since it is larger than the sum of its proper divisors (6099814002667).

22121012211221 is a wasteful number, since it uses less digits than its factorization.

22121012211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6681066872.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 22121012211221 its reverse (12211221012122), we get a palindrome (34332233223343).

The spelling of 22121012211221 in words is "twenty-two trillion, one hundred twenty-one billion, twelve million, two hundred eleven thousand, two hundred twenty-one".