21102201210220 has 192 divisors, whose sum is σ = 49997237713920. Its totient is φ = 7423085970432.

The previous prime is 21102201210217. The next prime is 21102201210241. The reversal of 21102201210220 is 2201210220112.

It is a happy number.

It is a super-2 number, since 2×21102201210220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21102201210194 and 21102201210203.

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, 5584068291 + ... + 5584072069.

It is an arithmetic number, because the mean of its divisors is an integer number (260402279760).

Almost surely, 2^{21102201210220} is an apocalyptic number.

21102201210220 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 21102201210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24998618856960).

21102201210220 is an abundant number, since it is smaller than the sum of its proper divisors (28895036503700).

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

21102201210220 is a wasteful number, since it uses less digits than its factorization.

21102201210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7304 (or 7302 counting only the distinct ones).

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

Adding to 21102201210220 its reverse (2201210220112), we get a palindrome (23303411430332).

The spelling of 21102201210220 in words is "twenty-one trillion, one hundred two billion, two hundred one million, two hundred ten thousand, two hundred twenty".