1311201123221 has 16 divisors (see below), whose sum is σ = 1431657859968. Its totient is φ = 1190954265600.

The previous prime is 1311201123217. The next prime is 1311201123257. The reversal of 1311201123221 is 1223211021131.

It is not a de Polignac number, because 1311201123221 - 2² = 1311201123217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311201123193 and 1311201123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311201123521) 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, 82556201 + ... + 82572081.

It is an arithmetic number, because the mean of its divisors is an integer number (89478616248).

Almost surely, 2^{1311201123221} is an apocalyptic number.

1311201123221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1311201123221 is a deficient number, since it is larger than the sum of its proper divisors (120456736747).

1311201123221 is a wasteful number, since it uses less digits than its factorization.

1311201123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22012.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1311201123221 its reverse (1223211021131), we get a palindrome (2534412144352).

The spelling of 1311201123221 in words is "one trillion, three hundred eleven billion, two hundred one million, one hundred twenty-three thousand, two hundred twenty-one".