121220310331321 has 4 divisors (see below), whose sum is σ = 121285447523044. Its totient is φ = 121155173139600.

The previous prime is 121220310331319. The next prime is 121220310331339. The reversal of 121220310331321 is 123133013022121.

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 22741262688400 + 98479047642921 = 4768780^2 + 9923661^2 .

It is a cyclic number.

It is not a de Polignac number, because 121220310331321 - 2¹ = 121220310331319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121220310331721) 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, 32568593070 + ... + 32568596791.

It is an arithmetic number, because the mean of its divisors is an integer number (30321361880761).

Almost surely, 2^{121220310331321} is an apocalyptic number.

It is an amenable number.

121220310331321 is a deficient number, since it is larger than the sum of its proper divisors (65137191723).

121220310331321 is an equidigital number, since it uses as much as digits as its factorization.

121220310331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65137191722.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 121220310331321 its reverse (123133013022121), we get a palindrome (244353323353442).

The spelling of 121220310331321 in words is "one hundred twenty-one trillion, two hundred twenty billion, three hundred ten million, three hundred thirty-one thousand, three hundred twenty-one".