22009212 has 24 divisors (see below), whose sum is σ = 57061200. Its totient is φ = 7336368.

The previous prime is 22009189. The next prime is 22009241. The reversal of 22009212 is 21290022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101787 + ... + 102002.

It is an arithmetic number, because the mean of its divisors is an integer number (2377550).

Almost surely, 2^22009212 is an apocalyptic number.

It is an amenable number.

22009212 is an abundant number, since it is smaller than the sum of its proper divisors (35051988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22009212 is a wasteful number, since it uses less digits than its factorization.

22009212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203802 (or 203794 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 22009212 is about 4691.3976595467. The cubic root of 22009212 is about 280.2430372843.

Adding to 22009212 its reverse (21290022), we get a palindrome (43299234).

The spelling of 22009212 in words is "twenty-two million, nine thousand, two hundred twelve".