121202212009 has 4 divisors (see below), whose sum is σ = 125381598660. Its totient is φ = 117022825360.

The previous prime is 121202211997. The next prime is 121202212031. The reversal of 121202212009 is 900212202121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900212202121 = 43003 ⋅20933707.

It can be written as a sum of positive squares in 2 ways, for example, as 32400000000 + 88802212009 = 180000^2 + 297997^2 .

It is not a de Polignac number, because 121202212009 - 2⁷ = 121202211881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121202212909) 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, 2089693282 + ... + 2089693339.

It is an arithmetic number, because the mean of its divisors is an integer number (31345399665).

Almost surely, 2^121202212009 is an apocalyptic number.

It is an amenable number.

121202212009 is a deficient number, since it is larger than the sum of its proper divisors (4179386651).

121202212009 is an equidigital number, since it uses as much as digits as its factorization.

121202212009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179386650.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 121202212009 in words is "one hundred twenty-one billion, two hundred two million, two hundred twelve thousand, nine".