1311201012221 has 8 divisors (see below), whose sum is σ = 1332819646464. Its totient is φ = 1289586363120.

The previous prime is 1311201012217. The next prime is 1311201012223. The reversal of 1311201012221 is 1222101021131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311201012221 - 2² = 1311201012217 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 1311201012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311201012223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329165 + ... + 1652498.

It is an arithmetic number, because the mean of its divisors is an integer number (166602455808).

Almost surely, 2^{1311201012221} is an apocalyptic number.

It is an amenable number.

1311201012221 is a deficient number, since it is larger than the sum of its proper divisors (21618634243).

1311201012221 is a wasteful number, since it uses less digits than its factorization.

1311201012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992571.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1311201012221 its reverse (1222101021131), we get a palindrome (2533302033352).

The spelling of 1311201012221 in words is "one trillion, three hundred eleven billion, two hundred one million, twelve thousand, two hundred twenty-one".