121331221313321 has 4 divisors (see below), whose sum is σ = 121331322344532. Its totient is φ = 121331120282112.

The previous prime is 121331221313311. The next prime is 121331221313411. The reversal of 121331221313321 is 123313122133121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53740789917721 + 67590431395600 = 7330811^2 + 8221340^2 .

It is a cyclic number.

It is not a de Polignac number, because 121331221313321 - 2⁴² = 116933174802217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121331221313311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48692276 + ... + 51123381.

It is an arithmetic number, because the mean of its divisors is an integer number (30332830586133).

Almost surely, 2^{121331221313321} is an apocalyptic number.

It is an amenable number.

121331221313321 is a deficient number, since it is larger than the sum of its proper divisors (101031211).

121331221313321 is an equidigital number, since it uses as much as digits as its factorization.

121331221313321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101031210.

The product of its digits is 3888, while the sum is 29.

Adding to 121331221313321 its reverse (123313122133121), we get a palindrome (244644343446442).

The spelling of 121331221313321 in words is "one hundred twenty-one trillion, three hundred thirty-one billion, two hundred twenty-one million, three hundred thirteen thousand, three hundred twenty-one".