1221003220220 has 96 divisors (see below), whose sum is σ = 3130679569920. Its totient is φ = 390677126400.

The previous prime is 1221003220081. The next prime is 1221003220249. The reversal of 1221003220220 is 220223001221.

It is a congruent number.

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, 3247331 + ... + 3603770.

It is an arithmetic number, because the mean of its divisors is an integer number (32611245520).

Almost surely, 2^{1221003220220} is an apocalyptic number.

1221003220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221003220220 is an abundant number, since it is smaller than the sum of its proper divisors (1909676349700).

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

1221003220220 is a wasteful number, since it uses less digits than its factorization.

1221003220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6851203 (or 6851201 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 1221003220220 its reverse (220223001221), we get a palindrome (1441226221441).

The spelling of 1221003220220 in words is "one trillion, two hundred twenty-one billion, three million, two hundred twenty thousand, two hundred twenty".