1220231221 has 8 divisors (see below), whose sum is σ = 1333813824. Its totient is φ = 1107090720.

The previous prime is 1220231171. The next prime is 1220231227. The reversal of 1220231221 is 1221320221.

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 not a de Polignac number, because 1220231221 - 2⁷ = 1220231093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220231195 and 1220231204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220231227) 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, 104736 + ... + 115801.

It is an arithmetic number, because the mean of its divisors is an integer number (166726728).

Almost surely, 2^1220231221 is an apocalyptic number.

1220231221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220231221 is a deficient number, since it is larger than the sum of its proper divisors (113582603).

1220231221 is a wasteful number, since it uses less digits than its factorization.

1220231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221051.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220231221 is about 34931.8081553188. The cubic root of 1220231221 is about 1068.5972303964.

Adding to 1220231221 its reverse (1221320221), we get a palindrome (2441551442).

The spelling of 1220231221 in words is "one billion, two hundred twenty million, two hundred thirty-one thousand, two hundred twenty-one".