22101212 has 36 divisors (see below), whose sum is σ = 45212496. Its totient is φ = 9260160.

The previous prime is 22101193. The next prime is 22101239. The reversal of 22101212 is 21210122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22101193 and 22101202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78512 + ... + 78792.

Almost surely, 2^22101212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22101212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22606248).

22101212 is an abundant number, since it is smaller than the sum of its proper divisors (23111284).

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

22101212 is a wasteful number, since it uses less digits than its factorization.

22101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 22101212 is about 4701.1926146458. The cubic root of 22101212 is about 280.6329727746.

Adding to 22101212 its reverse (21210122), we get a palindrome (43311334).

The spelling of 22101212 in words is "twenty-two million, one hundred one thousand, two hundred twelve".