1311111020121 has 16 divisors (see below), whose sum is σ = 2016212668800. Its totient is φ = 742332843648.

The previous prime is 1311111020113. The next prime is 1311111020123. The reversal of 1311111020121 is 1210201111131.

It is not a de Polignac number, because 1311111020121 - 2³ = 1311111020113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311111020121.

It is not an unprimeable number, because it can be changed into a prime (1311111020123) 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, 286391556 + ... + 286396133.

It is an arithmetic number, because the mean of its divisors is an integer number (126013291800).

Almost surely, 2^{1311111020121} is an apocalyptic number.

It is an amenable number.

1311111020121 is a deficient number, since it is larger than the sum of its proper divisors (705101648679).

1311111020121 is a wasteful number, since it uses less digits than its factorization.

1311111020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572787808.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 1311111020121 its reverse (1210201111131), we get a palindrome (2521312131252).

The spelling of 1311111020121 in words is "one trillion, three hundred eleven billion, one hundred eleven million, twenty thousand, one hundred twenty-one".