1320421221 has 24 divisors (see below), whose sum is σ = 2185220544. Its totient is φ = 752630400.

The previous prime is 1320421217. The next prime is 1320421231. The reversal of 1320421221 is 1221240231.

It is a happy number.

1320421221 is a `hidden beast` number, since 1 + 3 + 20 + 421 + 221 = 666.

It is not a de Polignac number, because 1320421221 - 2² = 1320421217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320421194 and 1320421203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320421231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 871 + ... + 51396.

It is an arithmetic number, because the mean of its divisors is an integer number (91050856).

Almost surely, 2^1320421221 is an apocalyptic number.

It is an amenable number.

1320421221 is a deficient number, since it is larger than the sum of its proper divisors (864799323).

1320421221 is a wasteful number, since it uses less digits than its factorization.

1320421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52681 (or 52678 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1320421221 is about 36337.6006500154. The cubic root of 1320421221 is about 1097.0779806885.

Adding to 1320421221 its reverse (1221240231), we get a palindrome (2541661452).

The spelling of 1320421221 in words is "one billion, three hundred twenty million, four hundred twenty-one thousand, two hundred twenty-one".