1321111201 has 4 divisors (see below), whose sum is σ = 1321219504. Its totient is φ = 1321002900.

The previous prime is 1321111199. The next prime is 1321111223. The reversal of 1321111201 is 1021111231.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1321111201 - 2¹ = 1321111199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321111261) 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 3 ways as a sum of consecutive naturals, for example, 33135 + ... + 61156.

It is an arithmetic number, because the mean of its divisors is an integer number (330304876).

Almost surely, 2^1321111201 is an apocalyptic number.

It is an amenable number.

1321111201 is a deficient number, since it is larger than the sum of its proper divisors (108303).

1321111201 is an equidigital number, since it uses as much as digits as its factorization.

1321111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108302.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1321111201 is about 36347.0934326254. The cubic root of 1321111201 is about 1097.2690384213.

Adding to 1321111201 its reverse (1021111231), we get a palindrome (2342222432).

The spelling of 1321111201 in words is "one billion, three hundred twenty-one million, one hundred eleven thousand, two hundred one".