1331320221121 has 4 divisors (see below), whose sum is σ = 1452349332144. Its totient is φ = 1210291110100.

The previous prime is 1331320221071. The next prime is 1331320221139. The reversal of 1331320221121 is 1211220231331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1331320221121 - 2²⁹ = 1330783350209 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331320221092 and 1331320221101.

It is not an unprimeable number, because it can be changed into a prime (1331320221151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60514555495 + ... + 60514555516.

It is an arithmetic number, because the mean of its divisors is an integer number (363087333036).

Almost surely, 2^{1331320221121} is an apocalyptic number.

1331320221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1331320221121 is a deficient number, since it is larger than the sum of its proper divisors (121029111023).

1331320221121 is a wasteful number, since it uses less digits than its factorization.

1331320221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121029111022.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1331320221121 its reverse (1211220231331), we get a palindrome (2542540452452).

The spelling of 1331320221121 in words is "one trillion, three hundred thirty-one billion, three hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".