1220321031021 has 64 divisors (see below), whose sum is σ = 1848155097600. Its totient is φ = 805604719680.

The previous prime is 1220321030993. The next prime is 1220321031029. The reversal of 1220321031021 is 1201301230221.

1220321031021 is a `hidden beast` number, since 12 + 2 + 0 + 321 + 0 + 310 + 21 = 666.

It is not a de Polignac number, because 1220321031021 - 2⁷ = 1220321030893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220321030985 and 1220321031003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220321031029) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 98240391 + ... + 98252811.

It is an arithmetic number, because the mean of its divisors is an integer number (28877423400).

Almost surely, 2^{1220321031021} is an apocalyptic number.

It is an amenable number.

1220321031021 is a deficient number, since it is larger than the sum of its proper divisors (627834066579).

1220321031021 is an equidigital number, since it uses as much as digits as its factorization.

1220321031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12878 (or 12860 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1220321031021 its reverse (1201301230221), we get a palindrome (2421622261242).

The spelling of 1220321031021 in words is "one trillion, two hundred twenty billion, three hundred twenty-one million, thirty-one thousand, twenty-one".