21201022202022 has 192 divisors, whose sum is σ = 51367467191040. Its totient is φ = 6277948685568.

The previous prime is 21201022201999. The next prime is 21201022202033. The reversal of 21201022202022 is 22020222010212.

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 = 21201022201986 and 21201022202004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 311475429 + ... + 311543487.

It is an arithmetic number, because the mean of its divisors is an integer number (267538891620).

Almost surely, 2^{21201022202022} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201022202022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25683733595520).

21201022202022 is an abundant number, since it is smaller than the sum of its proper divisors (30166444989018).

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

21201022202022 is a wasteful number, since it uses less digits than its factorization.

21201022202022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68579 (or 68576 counting only the distinct ones).

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

Adding to 21201022202022 its reverse (22020222010212), we get a palindrome (43221244212234).

The spelling of 21201022202022 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred two thousand, twenty-two".