22121212120 has 64 divisors (see below), whose sum is σ = 56912958720. Its totient is φ = 7580436864.

The previous prime is 22121212109. The next prime is 22121212121. The reversal of 22121212120 is 2121212122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22121212094 and 22121212103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121212121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541119 + ... + 580561.

It is an arithmetic number, because the mean of its divisors is an integer number (889264980).

Almost surely, 2^22121212120 is an apocalyptic number.

22121212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121212120 is an abundant number, since it is smaller than the sum of its proper divisors (34791746600).

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

22121212120 is a wasteful number, since it uses less digits than its factorization.

22121212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41464 (or 41460 counting only the distinct ones).

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

Adding to 22121212120 its reverse (2121212122), we get a palindrome (24242424242).

It can be divided in two parts, 221212 and 12120, that added together give a palindrome (233332).

The spelling of 22121212120 in words is "twenty-two billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty".