20221221000000 has 196 divisors, whose sum is σ = 66876629593184. Its totient is φ = 5392324800000.

The previous prime is 20221220999989. The next prime is 20221221000067. The reversal of 20221221000000 is 12212202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20221221000000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 370204 + ... + 6370203.

Almost surely, 2^{20221221000000} is an apocalyptic number.

20221221000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20221221000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33438314796592).

20221221000000 is an abundant number, since it is smaller than the sum of its proper divisors (46655408593184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20221221000000 is an frugal number, since it uses more digits than its factorization.

20221221000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6740452 (or 6740417 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20221221000000 its reverse (12212202), we get a palindrome (20221233212202).

The spelling of 20221221000000 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million", and thus it is an aban number.