12220021209 has 64 divisors (see below), whose sum is σ = 20008581120. Its totient is φ = 6537600000.

The previous prime is 12220021207. The next prime is 12220021241. The reversal of 12220021209 is 90212002221.

It is a happy number.

It is not a de Polignac number, because 12220021209 - 2¹ = 12220021207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12220021207) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1070884 + ... + 1082234.

It is an arithmetic number, because the mean of its divisors is an integer number (312634080).

Almost surely, 2^12220021209 is an apocalyptic number.

12220021209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12220021209 is a deficient number, since it is larger than the sum of its proper divisors (7788559911).

12220021209 is a wasteful number, since it uses less digits than its factorization.

12220021209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11502.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 12220021209 in words is "twelve billion, two hundred twenty million, twenty-one thousand, two hundred nine".