22222201212 has 36 divisors (see below), whose sum is σ = 56849574600. Its totient is φ = 7318153632.

The previous prime is 22222201207. The next prime is 22222201237. The reversal of 22222201212 is 21210222222.

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

It is a super-2 number, since 2×22222201212² (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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3715587 + ... + 3721562.

It is an arithmetic number, because the mean of its divisors is an integer number (1579154850).

Almost surely, 2^22222201212 is an apocalyptic number.

It is an amenable number.

22222201212 is an abundant number, since it is smaller than the sum of its proper divisors (34627373388).

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

22222201212 is a wasteful number, since it uses less digits than its factorization.

22222201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7437242 (or 7437237 counting only the distinct ones).

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

Adding to 22222201212 its reverse (21210222222), we get a palindrome (43432423434).

The spelling of 22222201212 in words is "twenty-two billion, two hundred twenty-two million, two hundred one thousand, two hundred twelve".