121321309 has 8 divisors (see below), whose sum is σ = 122544000. Its totient is φ = 120103776.

The previous prime is 121321307. The next prime is 121321339. The reversal of 121321309 is 903123121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121321309 - 2¹ = 121321307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121321309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59692 + ... + 61690.

It is an arithmetic number, because the mean of its divisors is an integer number (15318000).

Almost surely, 2^121321309 is an apocalyptic number.

It is an amenable number.

121321309 is a deficient number, since it is larger than the sum of its proper divisors (1222691).

121321309 is a wasteful number, since it uses less digits than its factorization.

121321309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 121321309 is about 11014.5952717292. The cubic root of 121321309 is about 495.0461596923.

It can be divided in two parts, 1213 and 21309, that added together give a palindrome (22522).

The spelling of 121321309 in words is "one hundred twenty-one million, three hundred twenty-one thousand, three hundred nine".