22022221212 has 18 divisors (see below), whose sum is σ = 55667281488. Its totient is φ = 7340740392.

The previous prime is 22022221211. The next prime is 22022221267. The reversal of 22022221212 is 21212222022.

22022221212 is a `hidden beast` number, since 220 + 222 + 212 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×22022221212² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22022221211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 305864148 + ... + 305864219.

Almost surely, 2^22022221212 is an apocalyptic number.

It is an amenable number.

22022221212 is an abundant number, since it is smaller than the sum of its proper divisors (33645060276).

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

22022221212 is a wasteful number, since it uses less digits than its factorization.

22022221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611728377 (or 611728372 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22022221212 its reverse (21212222022), we get a palindrome (43234443234).

The spelling of 22022221212 in words is "twenty-two billion, twenty-two million, two hundred twenty-one thousand, two hundred twelve".