121321321 has 16 divisors (see below), whose sum is σ = 138571776. Its totient is φ = 105210000.

The previous prime is 121321307. The next prime is 121321339. The reversal of 121321321 is 123123121.

It is a cyclic number.

It is not a de Polignac number, because 121321321 - 2¹⁷ = 121190249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121321295 and 121321304.

It is not an unprimeable number, because it can be changed into a prime (121321351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21706 + ... + 26716.

It is an arithmetic number, because the mean of its divisors is an integer number (8660736).

Almost surely, 2^121321321 is an apocalyptic number.

121321321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121321321 is a deficient number, since it is larger than the sum of its proper divisors (17250455).

121321321 is a wasteful number, since it uses less digits than its factorization.

121321321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124.

The product of its digits is 72, while the sum is 16.

The square root of 121321321 is about 11014.5958164610. The cubic root of 121321321 is about 495.0461760141.

Adding to 121321321 its reverse (123123121), we get a palindrome (244444442).

The spelling of 121321321 in words is "one hundred twenty-one million, three hundred twenty-one thousand, three hundred twenty-one".