121131321 has 4 divisors (see below), whose sum is σ = 161508432. Its totient is φ = 80754212.

The previous prime is 121131293. The next prime is 121131323. The reversal of 121131321 is 123131121.

It is a happy number.

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 121131321 - 2¹¹ = 121129273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121131321.

It is not an unprimeable number, because it can be changed into a prime (121131323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20188551 + ... + 20188556.

It is an arithmetic number, because the mean of its divisors is an integer number (40377108).

Almost surely, 2^121131321 is an apocalyptic number.

It is an amenable number.

121131321 is a deficient number, since it is larger than the sum of its proper divisors (40377111).

121131321 is an equidigital number, since it uses as much as digits as its factorization.

121131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40377110.

The product of its digits is 36, while the sum is 15.

The square root of 121131321 is about 11005.9675176697. The cubic root of 121131321 is about 494.7876121802.

Adding to 121131321 its reverse (123131121), we get a palindrome (244262442).

The spelling of 121131321 in words is "one hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty-one".