22122220212 has 36 divisors (see below), whose sum is σ = 56081241216. Its totient is φ = 7352818320.

The previous prime is 22122220151. The next prime is 22122220223. The reversal of 22122220212 is 21202222122.

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 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, 872964 + ... + 897947.

It is an arithmetic number, because the mean of its divisors is an integer number (1557812256).

Almost surely, 2^22122220212 is an apocalyptic number.

It is an amenable number.

22122220212 is an abundant number, since it is smaller than the sum of its proper divisors (33959021004).

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

22122220212 is a wasteful number, since it uses less digits than its factorization.

22122220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771268 (or 1771263 counting only the distinct ones).

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

Adding to 22122220212 its reverse (21202222122), we get a palindrome (43324442334).

The spelling of 22122220212 in words is "twenty-two billion, one hundred twenty-two million, two hundred twenty thousand, two hundred twelve".