121021221011209 has 4 divisors (see below), whose sum is σ = 121745898981504. Its totient is φ = 120296543040916.

The previous prime is 121021221011203. The next prime is 121021221011237. The reversal of 121021221011209 is 902110122120121.

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 121021221011209 - 2¹³ = 121021221003017 is a prime.

It is a super-2 number, since 2×121021221011209² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021221011203) 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, 362338984897 + ... + 362338985230.

It is an arithmetic number, because the mean of its divisors is an integer number (30436474745376).

Almost surely, 2^{121021221011209} is an apocalyptic number.

It is an amenable number.

121021221011209 is a deficient number, since it is larger than the sum of its proper divisors (724677970295).

121021221011209 is an equidigital number, since it uses as much as digits as its factorization.

121021221011209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724677970294.

The product of its (nonzero) digits is 288, while the sum is 25.

The spelling of 121021221011209 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, eleven thousand, two hundred nine".