1221002223220 has 48 divisors (see below), whose sum is σ = 2825560805760. Its totient is φ = 440347130496.

The previous prime is 1221002223143. The next prime is 1221002223277. The reversal of 1221002223220 is 223222001221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54595360 + ... + 54617719.

It is an arithmetic number, because the mean of its divisors is an integer number (58865850120).

Almost surely, 2^{1221002223220} is an apocalyptic number.

1221002223220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221002223220 is an abundant number, since it is smaller than the sum of its proper divisors (1604558582540).

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

1221002223220 is a wasteful number, since it uses less digits than its factorization.

1221002223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109213144 (or 109213142 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 1221002223220 its reverse (223222001221), we get a palindrome (1444224224441).

The spelling of 1221002223220 in words is "one trillion, two hundred twenty-one billion, two million, two hundred twenty-three thousand, two hundred twenty".