21201022020222 has 256 divisors, whose sum is σ = 54837583718400. Its totient is φ = 6000332359680.

The previous prime is 21201022020203. The next prime is 21201022020229. The reversal of 21201022020222 is 22202022010212.

21201022020222 is a `hidden beast` number, since 2 + 1 + 201 + 0 + 220 + 20 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21201022020195 and 21201022020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201022020229) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1033732104 + ... + 1033752612.

It is an arithmetic number, because the mean of its divisors is an integer number (214209311400).

Almost surely, 2^{21201022020222} is an apocalyptic number.

21201022020222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201022020222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27418791859200).

21201022020222 is an abundant number, since it is smaller than the sum of its proper divisors (33636561698178).

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

21201022020222 is a wasteful number, since it uses less digits than its factorization.

21201022020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21328 (or 21322 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21201022020222 its reverse (22202022010212), we get a palindrome (43403044030434).

The spelling of 21201022020222 in words is "twenty-one trillion, two hundred one billion, twenty-two million, twenty thousand, two hundred twenty-two".