220121011209 has 64 divisors (see below), whose sum is σ = 344862489600. Its totient is φ = 123400273920.

The previous prime is 220121011199. The next prime is 220121011217. The reversal of 220121011209 is 902110121022.

It is not a de Polignac number, because 220121011209 - 2⁵ = 220121011177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220121011219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16870042 + ... + 16883084.

It is an arithmetic number, because the mean of its divisors is an integer number (5388476400).

Almost surely, 2^220121011209 is an apocalyptic number.

It is an amenable number.

220121011209 is a deficient number, since it is larger than the sum of its proper divisors (124741478391).

220121011209 is a wasteful number, since it uses less digits than its factorization.

220121011209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13590.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 220121011209 in words is "two hundred twenty billion, one hundred twenty-one million, eleven thousand, two hundred nine".