22121000221 has 8 divisors (see below), whose sum is σ = 22238878464. Its totient is φ = 22003378320.

The previous prime is 22121000171. The next prime is 22121000233. The reversal of 22121000221 is 12200012122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22121000221 - 2¹¹ = 22120998173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121000621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110220 + ... + 237466.

It is an arithmetic number, because the mean of its divisors is an integer number (2779859808).

Almost surely, 2^22121000221 is an apocalyptic number.

It is an amenable number.

22121000221 is a deficient number, since it is larger than the sum of its proper divisors (117878243).

22121000221 is a wasteful number, since it uses less digits than its factorization.

22121000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128171.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22121000221 its reverse (12200012122), we get a palindrome (34321012343).

The spelling of 22121000221 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.