21222112021000 has 256 divisors, whose sum is σ = 54986143680000. Its totient is φ = 7602249600000.

The previous prime is 21222112020983. The next prime is 21222112021013. The reversal of 21222112021000 is 12021122212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 221041006 + ... + 221136994.

It is an arithmetic number, because the mean of its divisors is an integer number (214789623750).

Almost surely, 2^{21222112021000} is an apocalyptic number.

21222112021000 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 21222112021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27493071840000).

21222112021000 is an abundant number, since it is smaller than the sum of its proper divisors (33764031659000).

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

21222112021000 is a wasteful number, since it uses less digits than its factorization.

21222112021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96321 (or 96307 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222112021000 its reverse (12021122212), we get a palindrome (21234133143212).

It can be divided in two parts, 212221 and 12021000, that added together give a palindrome (12233221).

The spelling of 21222112021000 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, twenty-one thousand".