22201222212 has 36 divisors (see below), whose sum is σ = 60436661740. Its totient is φ = 6831145152.

The previous prime is 22201222189. The next prime is 22201222217. The reversal of 22201222212 is 21222210222.

It can be written as a sum of positive squares in 2 ways, for example, as 3896755776 + 18304466436 = 62424^2 + 135294^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (22201222217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23718787 + ... + 23719722.

Almost surely, 2^22201222212 is an apocalyptic number.

It is an amenable number.

22201222212 is an abundant number, since it is smaller than the sum of its proper divisors (38235439528).

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

22201222212 is a wasteful number, since it uses less digits than its factorization.

22201222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47438532 (or 47438527 counting only the distinct ones).

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

Adding to 22201222212 its reverse (21222210222), we get a palindrome (43423432434).

The spelling of 22201222212 in words is "twenty-two billion, two hundred one million, two hundred twenty-two thousand, two hundred twelve".