1331243222121 has 16 divisors (see below), whose sum is σ = 2020314918720. Its totient is φ = 865849249440.

The previous prime is 1331243222083. The next prime is 1331243222173. The reversal of 1331243222121 is 1212223421331.

1331243222121 is a `hidden beast` number, since 1 + 3 + 3 + 1 + 2 + 432 + 221 + 2 + 1 = 666.

It is not a de Polignac number, because 1331243222121 - 2¹³ = 1331243213929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1331243222321) 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, 601283095 + ... + 601285308.

It is an arithmetic number, because the mean of its divisors is an integer number (126269682420).

Almost surely, 2^{1331243222121} is an apocalyptic number.

It is an amenable number.

1331243222121 is a deficient number, since it is larger than the sum of its proper divisors (689071696599).

1331243222121 is a wasteful number, since it uses less digits than its factorization.

1331243222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202568453 (or 1202568447 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 1331243222121 its reverse (1212223421331), we get a palindrome (2543466643452).

The spelling of 1331243222121 in words is "one trillion, three hundred thirty-one billion, two hundred forty-three million, two hundred twenty-two thousand, one hundred twenty-one".