1201420321 has 4 divisors (see below), whose sum is σ = 1204824132. Its totient is φ = 1198016512.

The previous prime is 1201420307. The next prime is 1201420327. The reversal of 1201420321 is 1230241021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 365574400 + 835845921 = 19120^2 + 28911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201420321 - 2¹³ = 1201412129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201420295 and 1201420304.

It is not an unprimeable number, because it can be changed into a prime (1201420327) 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 3 ways as a sum of consecutive naturals, for example, 1701376 + ... + 1702081.

It is an arithmetic number, because the mean of its divisors is an integer number (301206033).

Almost surely, 2^1201420321 is an apocalyptic number.

It is an amenable number.

1201420321 is a deficient number, since it is larger than the sum of its proper divisors (3403811).

1201420321 is an equidigital number, since it uses as much as digits as its factorization.

1201420321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403810.

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

The square root of 1201420321 is about 34661.5106566347. The cubic root of 1201420321 is about 1063.0776584040.

Adding to 1201420321 its reverse (1230241021), we get a palindrome (2431661342).

The spelling of 1201420321 in words is "one billion, two hundred one million, four hundred twenty thousand, three hundred twenty-one".