20221221000221 has 8 divisors (see below), whose sum is σ = 20286863013888. Its totient is φ = 20155662450000.

The previous prime is 20221221000193. The next prime is 20221221000223. The reversal of 20221221000221 is 12200012212202.

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 a de Polignac number, because none of the positive numbers 2^k-20221221000221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20221221000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221221000223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20380505 + ... + 21349646.

It is an arithmetic number, because the mean of its divisors is an integer number (2535857876736).

Almost surely, 2^{20221221000221} is an apocalyptic number.

It is an amenable number.

20221221000221 is a deficient number, since it is larger than the sum of its proper divisors (65642013667).

20221221000221 is a wasteful number, since it uses less digits than its factorization.

20221221000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41731723.

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

Adding to 20221221000221 its reverse (12200012212202), we get a palindrome (32421233212423).

The spelling of 20221221000221 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.