22021212112 has 20 divisors (see below), whose sum is σ = 42692212836. Its totient is φ = 11003866880.

The previous prime is 22021212011. The next prime is 22021212113. The reversal of 22021212112 is 21121212022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4590875536 + 17430336576 = 67756^2 + 132024^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021212113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394189 + ... + 446572.

Almost surely, 2^22021212112 is an apocalyptic number.

It is an amenable number.

22021212112 is a deficient number, since it is larger than the sum of its proper divisors (20671000724).

22021212112 is a wasteful number, since it uses less digits than its factorization.

22021212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842406 (or 842400 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22021212112 its reverse (21121212022), we get a palindrome (43142424134).

It can be divided in two parts, 220212 and 12112, that added together give a square (232324 = 482²).

The spelling of 22021212112 in words is "twenty-two billion, twenty-one million, two hundred twelve thousand, one hundred twelve".