22021212222 has 12 divisors (see below), whose sum is σ = 47712626520. Its totient is φ = 7340404068.

The previous prime is 22021212221. The next prime is 22021212223. The reversal of 22021212222 is 22221212022.

22021212222 is a `hidden beast` number, since 220 + 212 + 12 + 222 = 666.

It is an interprime number because it is at equal distance from previous prime (22021212221) and next prime (22021212223).

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1223400679 = 22021212222 / (2 + 2 + 0 + 2 + 1 + 2 + 1 + 2 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 22021212195 and 22021212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021212221) 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, 611700322 + ... + 611700357.

It is an arithmetic number, because the mean of its divisors is an integer number (3976052210).

Almost surely, 2^22021212222 is an apocalyptic number.

22021212222 is an abundant number, since it is smaller than the sum of its proper divisors (25691414298).

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

22021212222 is a wasteful number, since it uses less digits than its factorization.

22021212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223400687 (or 1223400684 counting only the distinct ones).

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

Adding to 22021212222 its reverse (22221212022), we get a palindrome (44242424244).

The spelling of 22021212222 in words is "twenty-two billion, twenty-one million, two hundred twelve thousand, two hundred twenty-two".