1311021010121 has 16 divisors (see below), whose sum is σ = 1333965335040. Its totient is φ = 1288180185600.

The previous prime is 1311021010009. The next prime is 1311021010129. The reversal of 1311021010121 is 1210101201131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311021010121 is a prime.

It is a super-3 number, since 3×1311021010121³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311021010096 and 1311021010105.

It is not an unprimeable number, because it can be changed into a prime (1311021010129) 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, 43617320 + ... + 43647366.

It is an arithmetic number, because the mean of its divisors is an integer number (83372833440).

Almost surely, 2^{1311021010121} is an apocalyptic number.

It is an amenable number.

1311021010121 is a deficient number, since it is larger than the sum of its proper divisors (22944324919).

1311021010121 is an equidigital number, since it uses as much as digits as its factorization.

1311021010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31744.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 1311021010121 its reverse (1210101201131), we get a palindrome (2521122211252).

The spelling of 1311021010121 in words is "one trillion, three hundred eleven billion, twenty-one million, ten thousand, one hundred twenty-one".