1331343112221 has 12 divisors (see below), whose sum is σ = 1926294089148. Its totient is φ = 886065339264.

The previous prime is 1331343112213. The next prime is 1331343112241. The reversal of 1331343112221 is 1222113431331.

1331343112221 is a `hidden beast` number, since 1 + 3 + 3 + 1 + 3 + 431 + 1 + 2 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1008277056900 + 323066055321 = 1004130^2 + 568389^2 .

It is not a de Polignac number, because 1331343112221 - 2³ = 1331343112213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331343112201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124722330 + ... + 124733003.

It is an arithmetic number, because the mean of its divisors is an integer number (160524507429).

Almost surely, 2^{1331343112221} is an apocalyptic number.

It is an amenable number.

1331343112221 is a deficient number, since it is larger than the sum of its proper divisors (594950976927).

1331343112221 is a wasteful number, since it uses less digits than its factorization.

1331343112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249455932 (or 249455929 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 1331343112221 its reverse (1222113431331), we get a palindrome (2553456543552).

The spelling of 1331343112221 in words is "one trillion, three hundred thirty-one billion, three hundred forty-three million, one hundred twelve thousand, two hundred twenty-one".