1223321012220 has 192 divisors, whose sum is σ = 3642377155200. Its totient is φ = 306188144640.

The previous prime is 1223321012209. The next prime is 1223321012261. The reversal of 1223321012220 is 222101233221.

It is a congruent number.

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, 79115290 + ... + 79130750.

It is an arithmetic number, because the mean of its divisors is an integer number (18970714350).

Almost surely, 2^{1223321012220} is an apocalyptic number.

1223321012220 is a gapful number since it is divisible by the number (10) 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 1223321012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1821188577600).

1223321012220 is an abundant number, since it is smaller than the sum of its proper divisors (2419056142980).

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

1223321012220 is a wasteful number, since it uses less digits than its factorization.

1223321012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16768 (or 16766 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1223321012220 its reverse (222101233221), we get a palindrome (1445422245441).

The spelling of 1223321012220 in words is "one trillion, two hundred twenty-three billion, three hundred twenty-one million, twelve thousand, two hundred twenty".