1220021220220 has 24 divisors (see below), whose sum is σ = 2794957705008. Its totient is φ = 443644080000.

The previous prime is 1220021220191. The next prime is 1220021220281. The reversal of 1220021220220 is 220221200221.

It is a junction number, because it is equal to n+sod(n) for n = 1220021220194 and 1220021220203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2772775281 + ... + 2772775720.

It is an arithmetic number, because the mean of its divisors is an integer number (116456571042).

Almost surely, 2^{1220021220220} is an apocalyptic number.

1220021220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220021220220 is an abundant number, since it is smaller than the sum of its proper divisors (1574936484788).

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

1220021220220 is a wasteful number, since it uses less digits than its factorization.

1220021220220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5545551021 (or 5545551019 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 1220021220220 its reverse (220221200221), we get a palindrome (1440242420441).

The spelling of 1220021220220 in words is "one trillion, two hundred twenty billion, twenty-one million, two hundred twenty thousand, two hundred twenty".