1201320321 has 4 divisors (see below), whose sum is σ = 1601760432. Its totient is φ = 800880212.

The previous prime is 1201320319. The next prime is 1201320359. The reversal of 1201320321 is 1230231021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201320321 - 2¹ = 1201320319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201320321.

It is not an unprimeable number, because it can be changed into a prime (1201320301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200220051 + ... + 200220056.

It is an arithmetic number, because the mean of its divisors is an integer number (400440108).

Almost surely, 2^1201320321 is an apocalyptic number.

It is an amenable number.

1201320321 is a deficient number, since it is larger than the sum of its proper divisors (400440111).

1201320321 is an equidigital number, since it uses as much as digits as its factorization.

1201320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400440110.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1201320321 is about 34660.0681043763. The cubic root of 1201320321 is about 1063.0481625610.

Adding to 1201320321 its reverse (1230231021), we get a palindrome (2431551342).

The spelling of 1201320321 in words is "one billion, two hundred one million, three hundred twenty thousand, three hundred twenty-one".