220121109 has 24 divisors (see below), whose sum is σ = 357302400. Its totient is φ = 129568032.

The previous prime is 220121093. The next prime is 220121141. The reversal of 220121109 is 901121022.

It is not a de Polignac number, because 220121109 - 2⁴ = 220121093 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220121091 and 220121100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121189) 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 23 ways as a sum of consecutive naturals, for example, 38209 + ... + 43590.

It is an arithmetic number, because the mean of its divisors is an integer number (14887600).

Almost surely, 2^220121109 is an apocalyptic number.

It is an amenable number.

220121109 is a deficient number, since it is larger than the sum of its proper divisors (137181291).

220121109 is a wasteful number, since it uses less digits than its factorization.

220121109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81841 (or 81838 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 220121109 is about 14836.4789960422. The cubic root of 220121109 is about 603.7918279214.

The spelling of 220121109 in words is "two hundred twenty million, one hundred twenty-one thousand, one hundred nine".