1220330021 has 8 divisors (see below), whose sum is σ = 1275835200. Its totient is φ = 1165028832.

The previous prime is 1220330009. The next prime is 1220330029. The reversal of 1220330021 is 1200330221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220330021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220329978 and 1220330005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220330029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38696 + ... + 62753.

It is an arithmetic number, because the mean of its divisors is an integer number (159479400).

Almost surely, 2^1220330021 is an apocalyptic number.

It is an amenable number.

1220330021 is a deficient number, since it is larger than the sum of its proper divisors (55505179).

1220330021 is a wasteful number, since it uses less digits than its factorization.

1220330021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101995.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1220330021 is about 34933.2223105742. Note that the first 3 decimals coincide. The cubic root of 1220330021 is about 1068.6260704379.

Adding to 1220330021 its reverse (1200330221), we get a palindrome (2420660242).

It can be divided in two parts, 12203 and 30021, that added together give a palindrome (42224).

The spelling of 1220330021 in words is "one billion, two hundred twenty million, three hundred thirty thousand, twenty-one".