1321424121 has 16 divisors (see below), whose sum is σ = 1853553600. Its totient is φ = 836152128.

The previous prime is 1321424077. The next prime is 1321424123. The reversal of 1321424121 is 1214241231.

It is not a de Polignac number, because 1321424121 - 2⁶ = 1321424057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321424123) 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 15 ways as a sum of consecutive naturals, for example, 123586 + ... + 133851.

It is an arithmetic number, because the mean of its divisors is an integer number (115847100).

Almost surely, 2^1321424121 is an apocalyptic number.

It is an amenable number.

1321424121 is a deficient number, since it is larger than the sum of its proper divisors (532129479).

1321424121 is a wasteful number, since it uses less digits than its factorization.

1321424121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257528.

The product of its digits is 384, while the sum is 21.

The square root of 1321424121 is about 36351.3977860549. The cubic root of 1321424121 is about 1097.3556650735.

Adding to 1321424121 its reverse (1214241231), we get a palindrome (2535665352).

The spelling of 1321424121 in words is "one billion, three hundred twenty-one million, four hundred twenty-four thousand, one hundred twenty-one".