221122203011220 has 192 divisors, whose sum is σ = 726832679731200. Its totient is φ = 49168257596928.

The previous prime is 221122203011147. The next prime is 221122203011243. The reversal of 221122203011220 is 22110302221122.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 63 ways as a sum of consecutive naturals, for example, 95184757 + ... + 97480163.

It is an arithmetic number, because the mean of its divisors is an integer number (3785586873600).

Almost surely, 2^{221122203011220} is an apocalyptic number.

221122203011220 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 221122203011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363416339865600).

221122203011220 is an abundant number, since it is smaller than the sum of its proper divisors (505710476719980).

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

221122203011220 is a wasteful number, since it uses less digits than its factorization.

221122203011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301662 (or 2301660 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 221122203011220 its reverse (22110302221122), we get a palindrome (243232505232342).

The spelling of 221122203011220 in words is "two hundred twenty-one trillion, one hundred twenty-two billion, two hundred three million, eleven thousand, two hundred twenty".