21102100221222 has 192 divisors, whose sum is σ = 52323271004160. Its totient is φ = 6116730681600.

The previous prime is 21102100221197. The next prime is 21102100221233. The reversal of 21102100221222 is 22212200120112.

It is a happy number.

21102100221222 is a `hidden beast` number, since 2 + 1 + 10 + 210 + 0 + 221 + 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 = 21102100221195 and 21102100221204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13004697 + ... + 14537067.

It is an arithmetic number, because the mean of its divisors is an integer number (272517036480).

Almost surely, 2^{21102100221222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102100221222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26161635502080).

21102100221222 is an abundant number, since it is smaller than the sum of its proper divisors (31221170782938).

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

21102100221222 is a wasteful number, since it uses less digits than its factorization.

21102100221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532499 (or 1532496 counting only the distinct ones).

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

Adding to 21102100221222 its reverse (22212200120112), we get a palindrome (43314300341334).

The spelling of 21102100221222 in words is "twenty-one trillion, one hundred two billion, one hundred million, two hundred twenty-one thousand, two hundred twenty-two".