22021201209 has 16 divisors (see below), whose sum is σ = 35530005888. Its totient is φ = 11843334912.

The previous prime is 22021201171. The next prime is 22021201211. The reversal of 22021201209 is 90210212022.

It is a happy number.

It is not a de Polignac number, because 22021201209 - 2¹² = 22021197113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (22021200209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30841662 + ... + 30842375.

It is an arithmetic number, because the mean of its divisors is an integer number (2220625368).

Almost surely, 2^22021201209 is an apocalyptic number.

It is an amenable number.

22021201209 is a deficient number, since it is larger than the sum of its proper divisors (13508804679).

22021201209 is a wasteful number, since it uses less digits than its factorization.

22021201209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61684064.

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

The spelling of 22021201209 in words is "twenty-two billion, twenty-one million, two hundred one thousand, two hundred nine".