21021110202222 has 96 divisors (see below), whose sum is σ = 49800944793600. Its totient is φ = 6368986324800.

The previous prime is 21021110202163. The next prime is 21021110202223. The reversal of 21021110202222 is 22220201112012.

It is a happy number.

21021110202222 is a `hidden beast` number, since 21 + 0 + 211 + 10 + 202 + 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 = 21021110202195 and 21021110202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021110202223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39731779 + ... + 40257377.

It is an arithmetic number, because the mean of its divisors is an integer number (518759841600).

Almost surely, 2^{21021110202222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021110202222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24900472396800).

21021110202222 is an abundant number, since it is smaller than the sum of its proper divisors (28779834591378).

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

21021110202222 is a wasteful number, since it uses less digits than its factorization.

21021110202222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528238 (or 528235 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21021110202222 its reverse (22220201112012), we get a palindrome (43241311314234).

The spelling of 21021110202222 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, two hundred two thousand, two hundred twenty-two".