221123682108 has 192 divisors, whose sum is σ = 690020352000. Its totient is φ = 59822152128.

The previous prime is 221123682103. The next prime is 221123682119. The reversal of 221123682108 is 801286321122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221123682103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48246385 + ... + 48250967.

It is an arithmetic number, because the mean of its divisors is an integer number (3593856000).

Almost surely, 2^221123682108 is an apocalyptic number.

221123682108 is a gapful number since it is divisible by the number (28) 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 221123682108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345010176000).

221123682108 is an abundant number, since it is smaller than the sum of its proper divisors (468896669892).

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

221123682108 is a wasteful number, since it uses less digits than its factorization.

221123682108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7981 (or 7973 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 221123682108 in words is "two hundred twenty-one billion, one hundred twenty-three million, six hundred eighty-two thousand, one hundred eight".