1001220121220 has 24 divisors (see below), whose sum is σ = 2293704278208. Its totient is φ = 364080044000.

The previous prime is 1001220121201. The next prime is 1001220121261. The reversal of 1001220121220 is 221210221001.

It is a super-2 number, since 2×1001220121220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1001220121195 and 1001220121204.

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 7 ways as a sum of consecutive naturals, for example, 2275500056 + ... + 2275500495.

It is an arithmetic number, because the mean of its divisors is an integer number (95571011592).

Almost surely, 2^{1001220121220} is an apocalyptic number.

1001220121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001220121220 is an abundant number, since it is smaller than the sum of its proper divisors (1292484156988).

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

1001220121220 is a wasteful number, since it uses less digits than its factorization.

1001220121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551000571 (or 4551000569 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1001220121220 its reverse (221210221001), we get a palindrome (1222430342221).

The spelling of 1001220121220 in words is "one trillion, one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty".