121321213309 has 4 divisors (see below), whose sum is σ = 123377505120. Its totient is φ = 119264921500.

The previous prime is 121321213291. The next prime is 121321213313. The reversal of 121321213309 is 903312123121.

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 121321213309 - 2¹¹ = 121321211261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321213369) 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, 1028145817 + ... + 1028145934.

It is an arithmetic number, because the mean of its divisors is an integer number (30844376280).

Almost surely, 2^121321213309 is an apocalyptic number.

It is an amenable number.

121321213309 is a deficient number, since it is larger than the sum of its proper divisors (2056291811).

121321213309 is an equidigital number, since it uses as much as digits as its factorization.

121321213309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056291810.

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 121321213309 in words is "one hundred twenty-one billion, three hundred twenty-one million, two hundred thirteen thousand, three hundred nine".