21102210222220 has 96 divisors (see below), whose sum is σ = 47056050207936. Its totient is φ = 7921569177600.

The previous prime is 21102210222167. The next prime is 21102210222281. The reversal of 21102210222220 is 2222201220112.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 857417715 + ... + 857442325.

It is an arithmetic number, because the mean of its divisors is an integer number (490167189666).

Almost surely, 2^{21102210222220} is an apocalyptic number.

21102210222220 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 21102210222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23528025103968).

21102210222220 is an abundant number, since it is smaller than the sum of its proper divisors (25953839985716).

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

21102210222220 is a wasteful number, since it uses less digits than its factorization.

21102210222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31771 (or 31769 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21102210222220 its reverse (2222201220112), we get a palindrome (23324411442332).

The spelling of 21102210222220 in words is "twenty-one trillion, one hundred two billion, two hundred ten million, two hundred twenty-two thousand, two hundred twenty".