1220322231220 has 48 divisors (see below), whose sum is σ = 2725375947840. Its totient is φ = 457391542784.

The previous prime is 1220322231197. The next prime is 1220322231257. The reversal of 1220322231220 is 221322230221.

It is a junction number, because it is equal to n+sod(n) for n = 1220322231191 and 1220322231200.

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 15 ways as a sum of consecutive naturals, for example, 7828510 + ... + 7982869.

It is an arithmetic number, because the mean of its divisors is an integer number (56778665580).

Almost surely, 2^{1220322231220} is an apocalyptic number.

1220322231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220322231220 is an abundant number, since it is smaller than the sum of its proper divisors (1505053716620).

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

1220322231220 is a wasteful number, since it uses less digits than its factorization.

1220322231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15811632 (or 15811630 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 1220322231220 its reverse (221322230221), we get a palindrome (1441644461441).

Subtracting from 1220322231220 its reverse (221322230221), we obtain a palindrome (999000000999).

The spelling of 1220322231220 in words is "one trillion, two hundred twenty billion, three hundred twenty-two million, two hundred thirty-one thousand, two hundred twenty".