1311230310221 has 16 divisors (see below), whose sum is σ = 1450318396800. Its totient is φ = 1177605511488.

The previous prime is 1311230310209. The next prime is 1311230310227. The reversal of 1311230310221 is 1220130321131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1311230310221 - 2³⁴ = 1294050441037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311230310193 and 1311230310202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311230310227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17219810 + ... + 17295788.

It is an arithmetic number, because the mean of its divisors is an integer number (90644899800).

Almost surely, 2^{1311230310221} is an apocalyptic number.

It is an amenable number.

1311230310221 is a deficient number, since it is larger than the sum of its proper divisors (139088086579).

1311230310221 is a wasteful number, since it uses less digits than its factorization.

1311230310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111908.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1311230310221 its reverse (1220130321131), we get a palindrome (2531360631352).

The spelling of 1311230310221 in words is "one trillion, three hundred eleven billion, two hundred thirty million, three hundred ten thousand, two hundred twenty-one".