1201331321 has 4 divisors (see below), whose sum is σ = 1205576592. Its totient is φ = 1197086052.

The previous prime is 1201331311. The next prime is 1201331357. The reversal of 1201331321 is 1231331021.

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 a de Polignac number, because none of the positive numbers 2^k-1201331321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201331321.

It is not an unprimeable number, because it can be changed into a prime (1201331311) 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, 2122211 + ... + 2122776.

It is an arithmetic number, because the mean of its divisors is an integer number (301394148).

Almost surely, 2^1201331321 is an apocalyptic number.

It is an amenable number.

1201331321 is a deficient number, since it is larger than the sum of its proper divisors (4245271).

1201331321 is an equidigital number, since it uses as much as digits as its factorization.

1201331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245270.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1201331321 is about 34660.2267880636. The cubic root of 1201331321 is about 1063.0514071838.

Adding to 1201331321 its reverse (1231331021), we get a palindrome (2432662342).

It can be divided in two parts, 12013 and 31321, that added together give a palindrome (43334).

The spelling of 1201331321 in words is "one billion, two hundred one million, three hundred thirty-one thousand, three hundred twenty-one".