1201001321 has 16 divisors (see below), whose sum is σ = 1315676544. Its totient is φ = 1089673344.

The previous prime is 1201001311. The next prime is 1201001339. The reversal of 1201001321 is 1231001021.

It is a cyclic number.

It is not a de Polignac number, because 1201001321 - 2⁶ = 1201001257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1201001311) 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, 180170 + ... + 186716.

It is an arithmetic number, because the mean of its divisors is an integer number (82229784).

Almost surely, 2^1201001321 is an apocalyptic number.

It is an amenable number.

1201001321 is a deficient number, since it is larger than the sum of its proper divisors (114675223).

1201001321 is a wasteful number, since it uses less digits than its factorization.

1201001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6800.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1201001321 is about 34655.4659613747. The cubic root of 1201001321 is about 1062.9540598812.

Adding to 1201001321 its reverse (1231001021), we get a palindrome (2432002342).

The spelling of 1201001321 in words is "one billion, two hundred one million, one thousand, three hundred twenty-one".