1220331421 has 8 divisors (see below), whose sum is σ = 1264145400. Its totient is φ = 1177186560.

The previous prime is 1220331379. The next prime is 1220331439. The reversal of 1220331421 is 1241330221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 187416100 + 1032915321 = 13690^2 + 32139^2 .

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 1220331421 - 2¹³ = 1220323229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220331491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163566 + ... + 170863.

It is an arithmetic number, because the mean of its divisors is an integer number (158018175).

Almost surely, 2^1220331421 is an apocalyptic number.

It is an amenable number.

1220331421 is a deficient number, since it is larger than the sum of its proper divisors (43813979).

1220331421 is an equidigital number, since it uses as much as digits as its factorization.

1220331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334559.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1220331421 is about 34933.2423488001. The cubic root of 1220331421 is about 1068.6264790912.

Adding to 1220331421 its reverse (1241330221), we get a palindrome (2461661642).

The spelling of 1220331421 in words is "one billion, two hundred twenty million, three hundred thirty-one thousand, four hundred twenty-one".