20221222121000 has 128 divisors (see below), whose sum is σ = 47616026515200. Its totient is φ = 8037534956800.

The previous prime is 20221222120999. The next prime is 20221222121003. The reversal of 20221222121000 is 12122212202.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20221222121000.

It is not an unprimeable number, because it can be changed into a prime (20221222121003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 342337469 + ... + 342396531.

It is an arithmetic number, because the mean of its divisors is an integer number (372000207150).

Almost surely, 2^{20221222121000} is an apocalyptic number.

20221222121000 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 20221222121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23808013257600).

20221222121000 is an abundant number, since it is smaller than the sum of its proper divisors (27394804394200).

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

20221222121000 is a wasteful number, since it uses less digits than its factorization.

20221222121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61236 (or 61222 counting only the distinct ones).

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

Adding to 20221222121000 its reverse (12122212202), we get a palindrome (20233344333202).

The spelling of 20221222121000 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand".